I suspect that the zombicide games use the same size tiles (given the crossover)- meaning that the tiles from Black Plague could be ported over without much work except to determine which tiles are 'in shadow' for the MD dynamic. I would be interested to see tile graphics that could be stretched to the right size and printed for more home brewed stuff. Lots of possibility there.
You might want to go over to YouTube and watch the CMoN MD panel video. In it they stated for sure the tile were the same size by design and that the minis would use the same colors because they expected the fan base would want to make various fan made cross over scenarios.