Very possible. I'm leaving for work in a few minutes, so I can't look it up for you right now - but google for 'multi jamma'. If you have a JPAC it should be easy, if not there are still ways to wire it up.
I've got a machine that was wired for Moon Patrol and Mario Brothers, with a switch to flip between them. It's a project that I'm now trying to get rid of, but if those two games can be wired together then anything can!
P.S. I'm not the one who wired them, and haven't even figured out exactly how it's working - it's a rat's nest!