It makes sense for grandparents to be diff. since especially after the war were pple married cousins, pple from their hometown, shidduchim were really limited. PLUS our grandparents endured any pain. Anyone knows of a 70 yr old divorced man or woman? Not nearly as coomon as it is today.
Back on track, there are a lot of shidduchim that happen that I think I wouldnt have paired those two up. Who says husband and wife need to be exactly alike?