Well, you pays your money and you takes your chances. I sent payment for a Navy Arms 1873 today. This is the Uberti version, not the Turnbull finished high end rifle currently being offered by Navy Arms. The battery mate of this rifle is also by Uberti, a Cimarron Model P. I like that one a lot.
So, I will be shooting the same cartridge in both, same bullet, same charge of powder, just like the old days. Except I'm loading Unique at something less than 9 grains, rather than 40 grains of black. Couldn't fit that much in a modern case anyway.
I have been shooting one of the other pistol/rifle rounds that was somewhat popular in those days, 32-20. But this is from 1920s vintage firearms, and the rifle and pistol diverge here. Mild lead loads in the old Colt, and somewhat hotter JHP in the Savage 23. The 44s will be a new experience.