Probably a few other very subtle differences...but, I'm not that critical...

Also, it wouldn't bother me, if Uberti took the liberty of replacing the original flat springs, with the more modern and durable coil springs, internally.
On the Colt 1873 "P" frames...the handsprings and trigger sear springs were pretty fragile. I've never disassembled an 1860 Colt, I'm just guessing, so...I think it's unlikely they have any coil springs internally. Though, if the copy did...great.