I've got a consecutively #'d pair of those Uberti/Taylor's Remington conversions in 44-40, and they are definitely larger overall than the same gun in .44 percussion.
First time you put one into a holster specific for a .44 cap gun, you'll agree .....
The advantage of the .45 Colt conversions is that they can easily be switched back to .44 percussion, an option I don't have.