That protrusion on the cylinder for your gun is a gas ring. It's purpose is to keep powder fouling from getting between the cylinder and base pin and binding things up. It is not a part of the Remington design and Pietta has never incorporated it in their reproductions.
It would be useful to see photos of your gun with the cylinder installed.
This is just speculation but some target shooters that use the Remington platform have had their guns modified by installing a custom barrel that is threaded further back into the frame. The cylinder is then faced off to incorporate a gas ring. This keeps the guns running longer and the reduced powder capacity is not a factor for competition shooters who use light loads anyway.
As to dating your gun there should be a square box with two letters inside it. Those letters are the date proof code. If you post those we can tell you the date it was made.
If my speculation is correct and all other dimensions are the same you could have a machinist face off your new cylinders to match the one from your gun and be good to go.
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