I have found that Uberti NMA'S are smaller than Pietta NMA's anyway, not much but like you say noticable. Armi San Paolo is smaller yet, more like the Original Remington. Some say the ASP?Euroarms Navies are a smaller frame than the their NMA's if so, then they be more correct in size to the originals. Euroarms did not change out their machinery when they moved from San Paolo to where they are now and still produce the same pistols(at least the "58 Rem) that they did as ASP.
I have an ASP/Euroarms NMA enroute and it should be here anytime. Just found out the ASP/Euroarms '58 Remmy is due here on Friday! may be able to shoot it at the CAS match Sunday.