If it uses u8 and u10 then that's a ROM-2 BOARD.
The Korean ROMs are only 512 and the few Korean games I have were English language so you could try swapping Korean ROMs onto your GP4 using 27c4001s
FWIW all of my PCBs were screen for 27c4001 even if they used 27c801s
I don't think I've ever seen one labeled "ROM-3-BOARD" but I also don't have a huge amount of experience with these so I don't know how uncommon that is.
The Korean ROMs are only 512 and the few Korean games I have were English language so you could try swapping Korean ROMs onto your GP4 using 27c4001s
FWIW all of my PCBs were screen for 27c4001 even if they used 27c801s
I don't think I've ever seen one labeled "ROM-3-BOARD" but I also don't have a huge amount of experience with these so I don't know how uncommon that is.
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