I had heard DK was one of those games that was "Quirky" and there would be even seem to be variation from board to board, or at least between different revisions of the PCB.
I can't say from first-hand, but I would not doubt it for a second that it can be different. I assume if the pcb had even a slight variation in voltage input, it could throw the game timing off, or trigger more wild barrels, or change something of that nature.
The only thing I do know for sure is that I suck at DK no matter what.