Just received a reply from Cimarron on this matter. He agreed with me and the Whitneyville trigger screws should not be seen on the right side. He said it appears Uberti made the change without Cimarron's knowledge and that it is not correct for a Whitneyville Dragoon.
The gentleman from Cimarron, who sent me the response said he was going to email the owner of Cimarron and Uberti about this. Which, I suppose, is really all he can do.
So I guess that for the foreseeable future at least, no matter who you buy it from, a Uberti Whitneyville Dragoon, while being a very beautiful gun, is not going to be technically correct to the original 1848 Colt version.