Edit: I figured out that I could switch the CPU boards and just change the ROMs. Now I have to figure out what is wrong with my Royal Rumble CPU board.

I'm trying to trouble shoot some issues with my WWF Royal Rumble. It uses a 520-5021-05 PPB board and a Rev 3b CPU board. Can I use a 520-5021-00 PPB board and Rev 3 CPU board in place to test? It seems with the CPU board, the only difference is at CN3 where pins were added for a printer. Also, if I am able to switch the CPU boards, is it just a matter of placing in the WWF Royal Rumble ROM, or is the board somehow made for the machine. Still new to some of this, thanks for any help!