Started using unp64, by decrunching PRG's and comparing the MD5 hashes, the following results are a good start:
(md5 match, size > 800bytes, tosecname different, DAT = Demos [PRG])
Party-Time (1991-07-07)(Rookies).prg Party Time (19xx)(Rookies).prg
Rampage Demo (1987)(Industrial Light & Magic).prg Rampage Demo (19xx)(God and Hake).prg
Briliant (1986)(Triad).prg Brilliant (1986)(Triad).prg
Twisted Dimensions (1990)(1990)(Forces of Evil).prg Twisted Dimension (19xx)(Forces of Evil).prg
Robo Cop (1987)(Satan).prg Robo-Cop (1987-08-10)(World Pirating League).prg
Airdance 4 Unreleased Part (1991)(The Ancient Temple).prg Ad4 (19xx)(The Ancient Temple).prg
Ad4 (19xx)(The Ancient Temple).prg Airdance 4 Unreleased Part (1991)(The Ancient Temple).prg
Game Music III (1986)(The Mercenary Cracker).prg Game Music 3 (1991)(The Mercenary Cracker).prg
ZaxBox 29 (1995-08-07)(Mayhem).prg Zak Box 29 (1995)(Mayhem).prg
Musical Expertise (19xx)(Silicon Ltd).prg Musical Expertise (1990)(Silicon Limited).prg
Coke N Pepsi (1990)(Venom).prg Coke and Pepsi (19xx)(Venom).prg
Tide of Time (19xx)(Impulse).prg Tide of Time (1989)(Impulse).prg
Party Report (1990-11-29)(Censor Design).prg Party Report (1990-11-29)(Censor Design)
Acrise (19xx)(Alliance).prg Giga Demo (1990)(C64 Destroy Group).prg
Caledonian (19xx)(Alliance).prg Giga Demo (1990)(C64 Destroy Group).prg
Kasperintro (19xx)(Byterapers).prg Giga Demo (1990)(C64 Destroy Group).prg
Wizz Logo v.1.1 (19xx)(The Supply Team).prg Giga Demo (1990)(C64 Destroy Group).prg
Wizz Logo v.1.2 (19xx)(The Supply Team).prg Giga Demo (1990)(C64 Destroy Group).prg
Acrise (19xx)(Alliance).prg Kasperintro (19xx)(Byterapers).prg
Caledonian (19xx)(Alliance).prg Kasperintro (19xx)(Byterapers).prg
Giga Demo (1990)(C64 Destroy Group).prg Kasperintro (19xx)(Byterapers).prg
Wizz Logo v.1.1 (19xx)(The Supply Team).prg Kasperintro (19xx)(Byterapers).prg
Wizz Logo v.1.2 (19xx)(The Supply Team).prg Kasperintro (19xx)(Byterapers).prg
Do You Remember (19xx)(Warriors of Time).prg Do You Remember! (1991)(Offence).prg
3 Times Dope (1991)(Warnock of Arson).prg 3 Times Dope (1991)(Warnock of Arson)
We M.U.S.I.C. 06 - YMO (19xx)(Ratt & Benn).prg Comp Music 6 (19xx)(Benn and Ratt).prg
Comp Music 6 (19xx)(Benn and Ratt).prg We M.U.S.I.C. 06 - YMO (19xx)(Ratt & Benn).prg
Trail Mix (1988)(Soedesoft).prg Trail Mix (1989)(Fire Eagle).prg
Holiday Mix II (19xx)(Chuck Laboratories).prg Holiday Rap (19xx)(Intelligent Decision Limited).prg
Smooth Criminal (1989)(Ash & Dave).prg Smooth Criminal (1989)(Ash & Dave)
Shining 8 (1988)(Shining
.prg Hyperbyte (1988-05)(Shining
.prg
Thesis (1988)(The Last Science).prg Thesis (1988)(The Last Science)
Pimplesqueezer 1 (1988-02-15)(The Shadows)[a].prg Pimplesqueezer 1 (1988-02-15)(Shadows).prg
Pimplesqueezer 1 (1988-02-15)(Shadows).prg Pimplesqueezer 1 (1988-02-15)(The Shadows)[a].prg
Tales of Esgaroth 1 (1996)(Hitmen).prg Tales of Esgaroth 1 (1996)(Hitmen)
Quark Ball Demo V2 (1986)(ECA).prg Ball Demo v.2 (19xx)(Centrax - Samar).prg
Game Music VII (1986)(The Mercenary Cracker).prg Game Music 7 (1991)(The Mercenary Cracker).prg
Antic Demo (1988)(Transcom).prg Antic (1988)(Transcom).prg
Fan Tes Dickle Sex (1989)(Crazy).prg Fantesdickle Sex (19xx)(Titron).prg
Day after, The (1988)(New Life).prg Day After, The (19xx)(New Life).prg
No Name (19xx)(Quartet)
- .prg No Name Demo (1988)(Quartet).prg
Marrs Mix (1988)(The Last Science)
- .prg Marrs Mix (1988)(The Last Science).prg
Weiner Schnitsel (1991-03)(Shade).prg Weinerschnitzal (1991-03)(Shade Designs).prg
Lucifer's Revenge (1987)(Triad).prg Luciferz Revenge (1987)(Triad)
Hop Demo 1 (19xx)(The Supply Team).prg Hop Demo (1986)(The Supply Team).prg
Party Time (19xx)(Rookies).prg Party-Time (1991-07-07)(Rookies).prg
Brilliant (1986)(Triad).prg Briliant (1986)(Triad).prg
Black Genesis BBS (19xx)(Forces of Evil).prg Black Genesis (19xx)(Phantom).prg
Black Genesis (19xx)(Phantom).prg Black Genesis BBS (19xx)(Forces of Evil).prg
Game Music 3 (1991)(The Mercenary Cracker).prg Game Music III (1986)(The Mercenary Cracker).prg
Robo-Cop (1987-08-10)(World Pirating League).prg Robo Cop (1987)(Satan).prg
Zak Box 29 (1995)(Mayhem).prg ZaxBox 29 (1995-08-07)(Mayhem).prg
Be All, End All (1989)(Centauri).prg Be All End All (1989)(Centauri).prg
Be All End All (1989)(Centauri).prg Be All, End All (1989)(Centauri).prg
Coke and Pepsi (19xx)(Venom).prg Coke N Pepsi (1990)(Venom).prg
Dragon's Lair 2 (19xx)(Ian & Mic).prg Dragonlair 2 (19xx)(Ian & Mic).prg
Metal Bar 2 (1986)(Borderzone).prg Metal Bar II (1986)(Borderzone Dezign Team).prg
Acrise (19xx)(Alliance).prg Caledonian (19xx)(Alliance).prg
Giga Demo (1990)(C64 Destroy Group).prg Caledonian (19xx)(Alliance).prg
Kasperintro (19xx)(Byterapers).prg Caledonian (19xx)(Alliance).prg
Wizz Logo v.1.1 (19xx)(The Supply Team).prg Caledonian (19xx)(Alliance).prg
Wizz Logo v.1.2 (19xx)(The Supply Team).prg Caledonian (19xx)(Alliance).prg
Acrise (19xx)(Alliance).prg Wizz Logo v.1.1 (19xx)(The Supply Team).prg
Caledonian (19xx)(Alliance).prg Wizz Logo v.1.1 (19xx)(The Supply Team).prg
Giga Demo (1990)(C64 Destroy Group).prg Wizz Logo v.1.1 (19xx)(The Supply Team).prg
Kasperintro (19xx)(Byterapers).prg Wizz Logo v.1.1 (19xx)(The Supply Team).prg
Wizz Logo v.1.2 (19xx)(The Supply Team).prg Wizz Logo v.1.1 (19xx)(The Supply Team).prg
80 Days Ripp (19xx)(Formby Cracking Service).prg 80 Days Rip (1987)(Formby Cracking Group).prg
Trail Mix (1989)(Fire Eagle).prg Trail Mix (1988)(Soedesoft).prg
Essential 64 (1987)(Pulse Productions).prg Very Very (1987)(Pulse Productions).prg
Hyperbyte (1988-05)(Shining
.prg Shining 8 (1988)(Shining
.prg
2 Hours Work (1988-05)(Shadows - Fairlight)
- .prg 2 Hours Work (1988-05)(Shadows - Fairlight).prg
2 Hours Work (1988-05)(Shadows - Fairlight).prg 2 Hours Work (1988-05)(Shadows - Fairlight)
Ball Demo v.2 (19xx)(Centrax - Samar).prg Quark Ball Demo V2 (1986)(ECA).prg
Quick One, A (1988-01)(The Silents).prg Quick One (1987)(The Silents).prg
No Name Demo (1988)(Quartet).prg No Name (19xx)(Quartet)
Day After, The (19xx)(New Life).prg Day after, The (1988)(New Life).prg
Marrs Mix (1988)(The Last Science).prg Marrs Mix (1988)(The Last Science)
Treatz (19xx)(Zone2)
- .prg Treatz (19xx)(Zone2).prg
Hip Hop '88 (1988)(The Last Science)
- .prg Hip Hop '88 (1988)(The Last Science).prg
Hip Hop '88 (1988)(The Last Science).prg Hip Hop '88 (1988)(The Last Science)
Close Encounters (1994)(Mr. Computer).prg Close Encounter (19xx)(Megmyx).prg
Bas-Bot (1987)(Kernal).prg Dasbot (19xx)(Kernal).prg
Rage Hard (1987-02-12)(Danish Gold).prg Rage Hard (1987)(Danish Gold).prg
We M.U.S.I.C. 04 - Collection C (19xx)(Ratt & Benn).prg Comp Music 4 (19xx)(Benn and Ratt).prg
Comp Music 4 (19xx)(Benn and Ratt).prg We M.U.S.I.C. 04 - Collection C (19xx)(Ratt & Benn).prg
Chorus (19xx)(Digitized Design Group).prg Byterapers Chorus Singin (1987)(Digitize Design Group).prg
Zx81 world (19xx)(Mean team).prg ZX81 World (1987)(The Mean Team).prg
BBS Intro Casino (19xx)(Electron).prg Casino (1991-02-03)(Electron).prg
Hell No! (1988-03-18)(Confusing Solution - Super Swap Sweden).prg Hell No (1988)(Super Swap Sweden).prg
Rampage Demo (19xx)(God and Hake).prg Rampage Demo (1987)(Industrial Light & Magic).prg
Twisted Dimension (19xx)(Forces of Evil).prg Twisted Dimensions (1990)(1990)(Forces of Evil).prg
Musical Expertise (1990)(Silicon Limited).prg Musical Expertise (19xx)(Silicon Ltd).prg
Tide of Time (1989)(Impulse).prg Tide of Time (19xx)(Impulse).prg
Party Report (1990-11-29)(Censor Design)
- .prg Party Report (1990-11-29)(Censor Design).prg
Dragonlair 2 (19xx)(Ian & Mic).prg Dragon's Lair 2 (19xx)(Ian & Mic).prg
Metal Bar II (1986)(Borderzone Dezign Team).prg Metal Bar 2 (1986)(Borderzone).prg
Acrise (19xx)(Alliance).prg Wizz Logo v.1.2 (19xx)(The Supply Team).prg
Caledonian (19xx)(Alliance).prg Wizz Logo v.1.2 (19xx)(The Supply Team).prg
Giga Demo (1990)(C64 Destroy Group).prg Wizz Logo v.1.2 (19xx)(The Supply Team).prg
Kasperintro (19xx)(Byterapers).prg Wizz Logo v.1.2 (19xx)(The Supply Team).prg
Wizz Logo v.1.1 (19xx)(The Supply Team).prg Wizz Logo v.1.2 (19xx)(The Supply Team).prg
Do You Remember! (1991)(Offence).prg Do You Remember (19xx)(Warriors of Time).prg
3 Times Dope (1991)(Warnock of Arson)
- .prg 3 Times Dope (1991)(Warnock of Arson).prg
Holiday Rap (19xx)(Intelligent Decision Limited).prg Holiday Mix II (19xx)(Chuck Laboratories).prg
Hoeyspenning (1989-02)(Hoaxers).prg Høyspenning (1989-02-26)(Hoaxers).prg
Thesis (1988)(The Last Science)
- .prg Thesis (1988)(The Last Science).prg
Wonderland 1 (1989-06-01)(Triad).prg Wonderland 01 (1989)(Triad).prg
Wonderland 01 (1989)(Triad).prg Wonderland 1 (1989-06-01)(Triad).prg
Music Collection (1991)(-).prg Music Demo (1991)(Ikari - Talent).prg
Game Music 7 (1991)(The Mercenary Cracker).prg Game Music VII (1986)(The Mercenary Cracker).prg
Quick One (1987)(The Silents).prg Quick One, A (1988-01)(The Silents).prg
Treatz (19xx)(Zone2).prg Treatz (19xx)(Zone2)
Weinerschnitzal (1991-03)(Shade Designs).prg Weiner Schnitsel (1991-03)(Shade).prg
Music-Mix 4 (19xx)(Future Projects).prg Final Countdown (19xx)(Future Projects).prg
Luciferz Revenge (1987)(Triad)
- .prg Lucifer's Revenge (1987)(Triad).prg
Close Encounter (19xx)(Megmyx).prg Close Encounters (1994)(Mr. Computer).prg
Rage Hard (1987)(Danish Gold).prg Rage Hard (1987-02-12)(Danish Gold).prg
Beyond Amasample 1 (19xx)(Boys Without Brains).prg Beyond (1986)(Boys Without Brains).prg
Light Fantastic (1987)(The Mean Team).prg Light Fantastic (1987)(Meanteam).prg
Byterapers Chorus Singin (1987)(Digitize Design Group).prg Chorus (19xx)(Digitized Design Group).prg
Cold Nights in December (1988-12)(Jewels).prg C N I D (19xx)(Jewels).prg
ZX81 World (1987)(The Mean Team).prg Zx81 world (19xx)(Mean team).prg
Dexion's Demo (1987)(Dexion).prg Dexions Demo (19xx)(Dexion).prg
Warning, A (19xx)(Relax).prg Warning, a (1987)(Relax).prg
Party (1988)(Force Ten).prg Demo Pack (1988-10-09)(Force Ten).prg
DMC v5.0 Album 1 (2002-11-10)(Richard Bayliss).prg DMC v.5.0 - Album #$01 (19xx)(TND).prg
I-Alien (1987)(Ikari).prg I-Alien+4 [import] (1987-11-20)(Ikari - The Survivors).prg
Overkill Plus (19xx)(Men At Work).prg Overkill (19xx)(Men At Work).prg
Tales of Esgaroth 2 (1996-05)(Hitmen)
- .prg Tales of Esgaroth 2 (1996-05)(Hitmen).prg
Partystory (1988)(Inxs).prg Party Story (19xx)(INXS).prg
Oracle Demo (1987)(The Last Science).prg Oracle Demo (1987)(Higher Computer Science - The Last Science).prg
Nerd Herd (1989)(Federation Against Ikari - The Electronic Duo).prg Screw Ikari (19xx)(Swedish Hackers Against Ikari).prg
Powerdrive 2 (1989)(Rampar)
- .prg Powerdrive 2 (1989)(Rampar).prg
Shit Demo (1988)(ASC - Ray).prg Dexion (19xx)(Asc-Ray).prg
Dexion (19xx)(Asc-Ray).prg Shit Demo (1988)(ASC - Ray).prg
Power Drive 1 (19xx)(Rampar).prg Powerdrive 1 (1988)(Rampar).prg
Boh it Stinks (1998)(Plush).prg B0h It Stinks (19xx)(Plush).prg
C N I D (19xx)(Jewels).prg Cold Nights in December (1988-12)(Jewels).prg
Dexions Demo (19xx)(Dexion).prg Dexion's Demo (1987)(Dexion).prg
Warning, a (1987)(Relax).prg Warning, A (19xx)(Relax).prg
Demo Pack (1988-10-09)(Force Ten).prg Party (1988)(Force Ten).prg
Heavy X-Mosh (1990)(The Level 99 Industries).prg Happy X-Mosh (1989)(The Level Industries 99).prg
Breaker's End (1989)(Paramount).prg Good Bye (1989)(Paramount).prg
Overkill (19xx)(Men At Work).prg Overkill Plus (19xx)(Men At Work).prg
Prism (19xx)(Vortex).prg Prism (1991-11-19)(Dream).prg
Tales of Esgaroth 2 (1996-05)(Hitmen).prg Tales of Esgaroth 2 (1996-05)(Hitmen)
Day of Victory (1988)(Mechanix).prg D O Victory (19xx)(Mechanix Corporation 2124).prg
Oracle Demo (1987)(Higher Computer Science - The Last Science).prg Oracle Demo (1987)(The Last Science).prg
Thriller (1992)(Action)[a].prg Go Up (19xx)(Action).prg
Screw Ikari (19xx)(Swedish Hackers Against Ikari).prg Nerd Herd (1989)(Federation Against Ikari - The Electronic Duo).prg
Powerdrive 2 (1989)(Rampar).prg Powerdrive 2 (1989)(Rampar)
Hell No (1988)(Super Swap Sweden).prg Hell No! (1988-03-18)(Confusing Solution - Super Swap Sweden).prg
Mc Gottifant (19xx)(Cosmos Designs - Gotcha).prg Mc Gottifant (1991)(Crazy).prg
Mc Gottifant (1991)(Crazy).prg Mc Gottifant (19xx)(Cosmos Designs - Gotcha).prg
Prism (1991-11-19)(Dream).prg Prism (19xx)(Vortex).prg
Party Story (19xx)(INXS).prg Partystory (1988)(Inxs).prg
T.S.M. Visual (1988)(Digital Light & Magic).prg Guide To Cruciality (19xx)(God and Hake).prg
Guide To Cruciality (19xx)(God and Hake).prg T.S.M. Visual (1988)(Digital Light & Magic).prg
Caledonian (19xx)(Alliance).prg Acrise (19xx)(Alliance).prg
Giga Demo (1990)(C64 Destroy Group).prg Acrise (19xx)(Alliance).prg
Kasperintro (19xx)(Byterapers).prg Acrise (19xx)(Alliance).prg
Wizz Logo v.1.1 (19xx)(The Supply Team).prg Acrise (19xx)(Alliance).prg
Wizz Logo v.1.2 (19xx)(The Supply Team).prg Acrise (19xx)(Alliance).prg
80 Days Rip (1987)(Formby Cracking Group).prg 80 Days Ripp (19xx)(Formby Cracking Service).prg
Very Very (1987)(Pulse Productions).prg Essential 64 (1987)(Pulse Productions).prg
Smooth Criminal (1989)(Ash & Dave)
- .prg Smooth Criminal (1989)(Ash & Dave).prg
Høyspenning (1989-02-26)(Hoaxers).prg Hoeyspenning (1989-02)(Hoaxers).prg
Decay (1997)(Carcass)
- .prg Decay (1997)(Carcass).prg
Decay (1997)(Carcass).prg Decay (1997)(Carcass)
Music Demo (1991)(Ikari - Talent).prg Music Collection (1991)(-).prg
Tales of Esgaroth 1 (1996)(Hitmen)
- .prg Tales of Esgaroth 1 (1996)(Hitmen).prg
Fantesdickle Sex (19xx)(Titron).prg Fan Tes Dickle Sex (1989)(Crazy).prg
Antic Demo (1988)(Transcom).prg Antic (1988)(Transcom)[a].prg
Antic (1988)(Transcom).prg Antic Demo (1988)(Transcom).prg
Antic (1988)(Transcom)[a].prg Antic Demo (1988)(Transcom).prg
Tour De Europe (1991-08)(Flash)
- .prg Tour De Europe (1991-08)(Flash).prg
Tour De Europe (1991-08)(Flash).prg Tour De Europe (1991-08)(Flash)
Decade (1990-01-01)(Ecplise - Morrissey).prg Decade (1990-01-01)(Eclipse - Morrissey).prg
Decade (1990-01-01)(Eclipse - Morrissey).prg Decade (1990-01-01)(Ecplise - Morrissey).prg
Final Countdown (19xx)(Future Projects).prg Music-Mix 4 (19xx)(Future Projects).prg
Dasbot (19xx)(Kernal).prg Bas-Bot (1987)(Kernal).prg
Beyond (1986)(Boys Without Brains).prg Beyond Amasample 1 (19xx)(Boys Without Brains).prg
Hop Demo (1986)(The Supply Team).prg Hop Demo 1 (19xx)(The Supply Team).prg
Light Fantastic (1987)(Meanteam).prg Light Fantastic (1987)(The Mean Team).prg
Powerdrive 1 (1988)(Rampar).prg Power Drive 1 (19xx)(Rampar).prg
B0h It Stinks (19xx)(Plush).prg Boh it Stinks (1998)(Plush).prg
Casino (1991-02-03)(Electron).prg BBS Intro Casino (19xx)(Electron).prg
DMC v.5.0 - Album #$01 (19xx)(TND).prg DMC v5.0 Album 1 (2002-11-10)(Richard Bayliss).prg
I-Alien+4 [import] (1987-11-20)(Ikari - The Survivors).prg I-Alien (1987)(Ikari).prg
Happy X-Mosh (1989)(The Level Industries 99).prg Heavy X-Mosh (1990)(The Level 99 Industries).prg
Good Bye (1989)(Paramount).prg Breaker's End (1989)(Paramount).prg
D O Victory (19xx)(Mechanix Corporation 2124).prg Day of Victory (1988)(Mechanix).prg
Go Up (19xx)(Action).prg Thriller (1992)(Action)[a].prg
BBS Intro Black Rain (1992-04-17)(Arson)
- .prg BBS Intro Black Rain (1992-04-17)(Arson).prg
BBS Intro Black Rain (1992-04-17)(Arson).prg BBS Intro Black Rain (1992-04-17)(Arson)
