The PCR has an alloy frame which is thicker than the steel frame of the regular compact. (but I think we are only talking maybe 2mm at most) Shape-wise it is quite similar. I think what will happen is your new holster will just be tight at first. I would think that you should be able to get a good solid fit without any problem once you have broken in the holster. Eric (UT83) would know better than me however....
