Three of the heavy weights also launched on Wii U, and I'd imagine a good chunk of those buyers didn't get the Switch version. Helping AC out even more is the fact that there was no traditional AC game on Wii U, so for home console only owners they had been starving since City Folk. Not sure how we could "adjust" because some did buy both versions (I only bought one for both, 8 Delux).
I like the comparison, I just don't know how to o do it fairly.