There are some examples of a manufacturer using the exact system for several games. Williams, for instance - the hardware that ran Joust also ran Robotron 2049

There are some examples of a manufacturer using the exact system for several games. Williams, for instance - the hardware that ran Joust also ran Robotron 2049 and several other games, requiring no more than a ROM swap and controller layout change. It's actually not uncommon to find out that a Joust cabinet has painted-over Robotron 2049 panel art and vice versa, depending on how many orders of what they got in a particular week.