Yes. The interconnect harness is the same across 80, 80a, and 80b.
If you have an original one, it's highly recommended to install the two additional jumpers (for ground and 5v). However, the bifrucated pins are incredibly difficult to find now, so some people resort to stealing them from a spare interconnect harness.
However, first try cleaning the edge connectors with a pink rubber eraser if you're having trouble with your game. That can resolve a lot of connector-based problems. So far, repinning the entire connector hasn't been necessary for the games I've worked on.