If you identified the cylinders correctly, there is no way that cylinder is original to the pictured frame. The frame shows wear and use, and there is almost no wear on the cylinder ratchet (compare with the one you say is from an authentic 1858). The nipples are brand new, of the modern style. The honest replacement of nipples for shooting is one thing, but those don't look like caps were ever put on them. And of course, new nipples indicate someone has worked on that gun.
Further, we have a cylinder with considerable rust on the sides but no corrosion or rust around the nipples, or around the chambers in the front. That can only happen if a new cylinder was artificially rusted, then installed. So at the very least, we have a new cylinder, with new nipples, installed and aged to look old, a sure sign of a fake.
The chamber wall dimensions are greater in the questionable cylinder than in the authentic one; that might mean only wear on the old cylinder, but check the chamber dimensions and the cylinder diameters. It might be educational to pull the nipples from a couple of chambers and look down the barrel while shining a light through the rear of the frame. I think the chambers might not line up with the barrel in the vertical direction.
Note also the hammer and trigger screws, which are modern replacements.
So, here, FWIW, is my take. An original frame and barrel, cleaned, filed to remove pits and rust, then cold blued. Maybe original parts, also cleaned, some replaced with aged parts. A cylinder too bad to fix, so replaced with a repro cylinder, also aged.
Jim
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