Well, I can't find any credible information about Zampano's meaning. I did find it as a word on Wiktionary but I doubt it has the same etymology as the surname.
So, in that sense, it could be related Zumpano or it could not. Since there's little information about Zampano, one could just take an educated guess, I suppose. We just got to wait and see if someone with a lot of knowledge about Italian surnames steps in to try to find out the etymology.