A Rebbi of mine in yeshiva said in the name of Rav Ruderman Z"tlz"tl who referred to a Chazal that a person should ideally try to marry someone from the "same streetמבוי (street), if not then the same neighbourhoodשכונה (neighbourhood), and if not then the same cityעיר (city)," explaining that the fewer differences there are, the easier the adjustment which is required for marriage.
My question is where this Chazal is located? (My Rebbi wasn't sure, although I was wondering if it's Yalkut Shimoni 391:14)