Depends... They were mostly all swappable. I've got a vintage arcade cab that has been converted to the "JAMMA" standard/pinout. Some PCBs (but not all) that

Depends... They were mostly all swappable. I've got a vintage arcade cab that has been converted to the "JAMMA" standard/pinout. Some PCBs (but not all) that aren't JAMMA can be converted to JAMMA using an adapter you put on the PCB. It was extremely common in some places (tennis clubhouses, bowling places, etc.) to have one or two arcade cabs and then semi-regularly switch the PCB inside it. For some cabs you could even change the "marquee" (the top of the arcade cab, above the screen: typically showing the name of the game) easily too, so that it would match the PCB inside. People running bootleg arcade cabs typically wouldn't bother changing the marquee: they'd just swap the PCB (typically for a bootleg PCB).