Those rev 2s probably did come out of a Missile Command, and would probably be fine in another Missile Command. I run a rev 2 in my MC cab with no problems.
I think there may be an issue running a rev 2 to power versions 01 & 03 of the MC PCBs, on account of those boards having far more ROM/PROM chips on board, and therefore drawing more power. That's the theory (I think), but again, I've run a rev 2 AR2 with an 03 MC PCB without issue.