Mira si puede ser este:
http://www.progettoemma.net/gioco.php?game=spangblDale donde pone PCB info, haz click en 17 roms, ahi te sale un listado, esa es la version world bootleg.
y si luegos le das a read code, te enlaza con el codigo y puedes ver a que grupo perteneces las diferentes roms.
Edito:
Te copio la parte del codigo referente al bootleg del super pang.
ROM_START(
spangbl )
ROM_REGION( 0x50000*2, "
maincpu", ROMREGION_ERASEFF )
ROM_LOAD( "
ic17.1", 0x00000, 0x08000, CRC(f0b2bf86) SHA1(b42a6c0b98c7ccd1e8acd41066a25c7ed4a3aabe) )
ROM_CONTINUE(0x50000,0x8000)
ROM_LOAD( "ic18.2", 0x60000, 0x04000, CRC(6f377832) SHA1(25755ed77a797f50fdfbb4c42a04f51d3d08f87c) )
ROM_CONTINUE(0x10000,0x4000)
ROM_CONTINUE(0x64000,0x4000)
ROM_CONTINUE(0x14000,0x4000)
ROM_CONTINUE(0x68000,0x4000)
ROM_CONTINUE(0x18000,0x4000)
ROM_CONTINUE(0x6c000,0x4000)
ROM_CONTINUE(0x1c000,0x4000)
ROM_CONTINUE(0x70000,0x4000)
ROM_CONTINUE(0x20000,0x4000)
ROM_CONTINUE(0x74000,0x4000)
ROM_CONTINUE(0x24000,0x4000)
ROM_CONTINUE(0x78000,0x4000)
ROM_CONTINUE(0x28000,0x4000)
ROM_CONTINUE(0x7c000,0x4000)
ROM_CONTINUE(0x2c000,0x4000)
ROM_LOAD( "ic19.3", 0x40000, 0x04000, CRC(7c776309) SHA1(8861ed11484ca0727dfbc3003888a9de32ed8ecc) )
ROM_CONTINUE(0x48000,0x4000)
ROM_CONTINUE(0x44000,0x4000)
ROM_CONTINUE(0x4c000,0x4000)
ROM_REGION( 0x20000, "audiocpu", 0 ) /* Sound Z80 + M5205 samples */
ROM_LOAD( "ic28.4", 0x00000, 0x10000, CRC(02b07d0a) SHA1(77cb9bf1b0d93ebad1bd8cdbedb7fdbad23697be) )
ROM_LOAD( "ic45.5", 0x10000, 0x10000, CRC(95c32824) SHA1(02de90a7bfbe89feb7708fda8dfac4ed32bc0773) )
ROM_REGION( 0x100000, "gfx1", ROMREGION_INVERT| ROMREGION_ERASE00 )
ROM_LOAD16_BYTE( "ic79.11", 0x000001, 0x10000, CRC(10839ddd) SHA1(bfb56aa5d6ee1d3aa19e346264bee90d64545e51) )
ROM_LOAD16_BYTE( "ic78.7", 0x000000, 0x10000, CRC(c1d5df89) SHA1(a86e641af1b41c8f642fe3a14ebcbe6c27f80c79) )
ROM_LOAD16_BYTE( "ic49.10", 0x020001, 0x10000, CRC(113c2753) SHA1(37b480b5d9c581d3c807c81924b4bbbc21d0698d) )
ROM_LOAD16_BYTE( "ic48.6", 0x020000, 0x10000, CRC(4ffae6c9) SHA1(71df3c374a24d6a90e78d33929cb91d05bd10b78) )
ROM_LOAD16_BYTE( "ic81.13", 0x080001, 0x10000, CRC(ebe9c63a) SHA1(1aeeea5051086405ceb803ca7a5bfd82a07ade0f) )
ROM_LOAD16_BYTE( "ic80.9", 0x080000, 0x10000, CRC(f680051d) SHA1(b6e09e14baf839961f46e0986d2c17f7edfaf13d) )
ROM_LOAD16_BYTE( "ic51.12", 0x0a0001, 0x10000, CRC(beb49dc9) SHA1(c93f65b0f4ce0a0f400202f2998b89abad1f6942) )
ROM_LOAD16_BYTE( "ic50.8", 0x0a0000, 0x10000, CRC(3f91014c) SHA1(b3947caa0c667d871c19d7dda6536d043ad296f2) )
ROM_REGION( 0x040000, "gfx2", ROMREGION_INVERT )
ROM_LOAD( "ic94.17", 0x000000, 0x10000, CRC(a56f3c20) SHA1(cb440e0e612da8b8a50fe25a6336869b62ab4cfd) )
ROM_LOAD( "ic95.16", 0x020000, 0x10000, CRC(14df4659) SHA1(d73fab0a8c1e56a26cc15333a294e876f1552bc9) )
ROM_LOAD( "ic124.15", 0x010000, 0x10000, CRC(4702c768) SHA1(ff996f1355f32451fa57836c2255027a8108eb40) )
ROM_LOAD( "ic125.14", 0x030000, 0x10000, CRC(bd5c2f4b) SHA1(3c71d63637633a98ab513e4336e2954af3f964f4) )
ROM_END
Parece que la que tienes tu diferente es una de las memorias de programa si no me equivoco.