they will fit the 22/45 as long as it's the MKIII replaceable panel version with bushings installed. You'll have to round off the bottom rear corner of the 1911 grips. IIRC the OEM ruger "RP" models use slim/profile 1911 grip thickness and slim bushings. Don't quote me on that. But I've seen a lot of 1911 panels on 22/45s.
I don't know about the MKIV 22/45 assuming there is one.