Make sure you use decrypted sets in NRX as thats all that emulator uses its not a matter of been mame or kawaks stes as long as the rom is decrypted and has rom instead of bin then things should be fine will work if all are the same xxx-xx.rom or xxx_xx.rom NRX checks the P rom ID ( cart ID ) and if supported it show in the list if not it will be placed at the bottom it should still work though.