I had a 35 Remington unported and still have a 45-70 un ported. The recoil of the 45-70 is much greater. In a way, it hurts a bit whereas the 35 had a heavy recoil, but wasn't too painful.
It is hard to describe such a feeling over print. If possible, I would see if I could go to a range and try both.
I have had people shoot my 45-70 un-ported and never want another shot. But they weren'ty accomplished handgunners either.