Basically the MVS is a piece of hardware, on which you can run various pieces of software in the form of MVS cartridges, just like a NES for an instance.
PCB stands for printed circuit board, and usually refers to arcade games which include both the hardware and the software in the same pcb and, therefore, games are not changeable.
You can play both of them in JAMMA compatible cabinets or superguns, as long as the pcbs you are using follow the JAMMA standard (the MVS does)
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