Double Donkey Kong Multigame 2n1 hack or not?

I bought one of these a couple years ago. I guess it is a hack but you have both games on the DK jr. PCB. The only difference I noticed is a sound difference when Mario walks on DK. The game play is the same though, as far as I can tell and I've hit the kill screen on both of these titles.
 
So is this all on the dkjr board or is another board involved?
 
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