I don't think George Romney got anywhere near "the same stuff" as Mitt. I was a working TV newsman (please forgive me) during the campaign, was from GR's home state of Mich (again, please forgive me, I did move South as soon as I was an adult) and GR was such an imposing intellect that his faith didn't get in the way, IMO.
All that you said is true about GR. I grew up there when GR was Gov.