This should be a new parent or not?

at line 3370 add this
(!strcmp(machine().system().name, "panicprkjb")) ||

ROM_START( panicprkjb )
	ROM_REGION32_BE( 0x400000, "user1", 0 ) /* 4 megs for main R4650 code */
	ROM_LOAD16_BYTE( "pnp1ver-b.ic2", 0x000000, 0x200000, CRC(a46e34f8) SHA1(c84eb701a1e01e706dea515acaaf6d98ad53f453) )
	ROM_LOAD16_BYTE( "pnp1ver-b.ic1", 0x000001, 0x200000, CRC(4de52a64) SHA1(7edd974d52e17bcbdb029f718c06d603ed558d90) )

	ROM_REGION( 0x80000, "subcpu", 0 )  /* Hitachi H8/3002 MCU code */
	ROM_LOAD16_WORD_SWAP( "pnp1ver-b.ic3", 0x000000, 0x080000, CRC(fe4bc6f4) SHA1(2114dc4bc63d589e6c3b26a73dbc60924f3b1765) )

	ROM_REGION( 0x40000, "iocpu", 0 )   /* I/O board HD643334 H8/3334 MCU code */
	ROM_LOAD( "asca-3a.ic14", 0x000000, 0x040000, CRC(8e9266e5) SHA1(ffa8782ca641d71d57df23ed1c5911db05d3df97) )

	ROM_REGION32_BE( 0x2000000, "data", 0 ) /* data roms */
	ROM_LOAD16_BYTE( "pnp1mtah.2j",  0x000000, 0x800000, CRC(37addddd) SHA1(3032989653304417df80606bc3fde6e9425d8cbb) )
	ROM_LOAD16_BYTE( "pnp1mtal.2h",  0x000001, 0x800000, CRC(6490faaa) SHA1(03443746009b434e5d4074ea6314910418907360) )

	ROM_REGION( 0x2000000, "textile", 0 )   /* texture tiles */
	ROM_LOAD( "pnp1cgll.4m",  0x0000000, 0x800000, CRC(d03932cf) SHA1(49240e44923cc6e815e9457b6290fd18466658af) )
	ROM_LOAD( "pnp1cglm.5k",  0x0800000, 0x800000, CRC(abf4ccf2) SHA1(3848e26d0ba6c872bbc6d5e0eb23a9d4b34152d5) )
	ROM_LOAD( "pnp1cgum.4j",  0x1000000, 0x800000, CRC(206217ca) SHA1(9c095bba7764f3405c3fab10513b9b78981ec44d) )
	ROM_LOAD( "pnp1cguu.5f",  0x1800000, 0x800000, CRC(cd64f57f) SHA1(8780270298e0823db1acbbf79396788df0c3c19c) )

	ROM_REGION16_LE( 0x200000, "textilemapl", 0 )   /* texture tilemap 0-15 */
	ROM_LOAD( "pnp1ccrl.7f",  0x000000, 0x200000, CRC(b7bc43c2) SHA1(f4b470540194486ca6822f438fc1d4700cfb2ab1) )

	ROM_REGION( 0x200000, "textilemaph", 0 )        /* texture tilemap 16-17 + attr */
	ROM_LOAD( "pnp1ccrh.7e",  0x000000, 0x200000, CRC(caaf1b73) SHA1(b436992817ab4e4dad05e7429eb102d4fb57fa6a) )

	ROM_REGION32_BE( 0x2000000, "pointrom", 0 ) /* 3D model data */
	ROM_LOAD32_WORD_SWAP( "pnp1pt0h.7a",  0x000000, 0x400000, CRC(43fc2246) SHA1(301d321cd4a01ebd7ccfa6f295d6c3daf0a19efe) )
	ROM_LOAD32_WORD_SWAP( "pnp1pt0l.7c",  0x000002, 0x400000, CRC(26af5fa1) SHA1(12fcf98c2a59643e0fdfdd7186f9f16baf54a9cf) )
	ROM_LOAD32_WORD_SWAP( "pnp1pt1h.5a",  0x800000, 0x400000, CRC(1ff470c0) SHA1(ca8fad90743589744939d681b0ce94f368337b3f) )
	ROM_LOAD32_WORD_SWAP( "pnp1pt1l.5c",  0x800002, 0x400000, CRC(15c6f236) SHA1(e8c393359a91cdce6e9110a48c0a80708f8fc132) )

	ROM_REGION( 0x1000000, "c352", 0 ) /* C352 PCM samples */
	ROM_LOAD( "pnp1wavel.2c", 0x000000, 0x800000, CRC(35c6a9bd) SHA1(4b56fdc37525c15e57d93091e6609d6a6905fc5c) )
	ROM_LOAD( "pnp1waveh.2a", 0x800000, 0x800000, CRC(6fa1826a) SHA1(20a5af49e65ae2bc57c016b5cd9bafa5a5220d35) )

	ROM_REGION( 0x800000, "dups", 0 )   /* duplicate roms */
	ROM_LOAD( "pnp1cguu.4f",  0x000000, 0x800000, CRC(cd64f57f) SHA1(8780270298e0823db1acbbf79396788df0c3c19c) )
	ROM_LOAD( "pnp1cgum.5j",  0x000000, 0x800000, CRC(206217ca) SHA1(9c095bba7764f3405c3fab10513b9b78981ec44d) )
	ROM_LOAD( "pnp1cgll.5m",  0x000000, 0x800000, CRC(d03932cf) SHA1(49240e44923cc6e815e9457b6290fd18466658af) )
	ROM_LOAD( "pnp1cglm.4k",  0x000000, 0x800000, CRC(abf4ccf2) SHA1(3848e26d0ba6c872bbc6d5e0eb23a9d4b34152d5) )
	ROM_LOAD( "pnp1ccrl.7m",  0x000000, 0x200000, CRC(b7bc43c2) SHA1(f4b470540194486ca6822f438fc1d4700cfb2ab1) )
	ROM_LOAD( "pnp1ccrh.7k",  0x000000, 0x200000, CRC(caaf1b73) SHA1(b436992817ab4e4dad05e7429eb102d4fb57fa6a) )
ROM_END

GAME( 1998, panicprkjb,    panicprk,        s23,         s23,       namcos23_state, s23, ROT0, "Namco", "Panic Park (PNP1 Ver. B)",     GAME_FLAGS )