From reading threads, I'd guess is that Uberti parts would be a closer fit than Pietta.
A poster in this thread said that an Uberti cylinder was a drop in fit with his ASP Remington.--->>>
https://1858remington.com/index.php?topic=8323.0
You can contact VTI gun parts and ask them for their advice.
They sell both Uberti and Pietta parts.
That doesn't mean that the parts from one company will directly interchange with another.
However, one company's part may require less fitting than another.
VTI Gun Parts: --->>>
https://www.vtigunparts.com/store/
At one time, S&S Firearms used to carry a lot of Euroarms parts but that was a long time ago.
You can contact them to see what they say.
https://www.ssfirearms.com
Sometimes you may be able find parts on eBay or from European sources.
The Euroarms guns were said to be made close to the originals, so perhaps even replacement parts for the original may fit.
Lodgewood MFG. sells an original Remington replacement trigger. --->>>
https://www.lodgewood.com/Original-Remington-Army-Trigger_p_1730.html
Henry Krank was a large Euroarms seller in the UK who offered some other Euroarms revolver parts online until recently.
They may have some info. on parts, but you'd probably need to inquire by email. --->>>
https://www.henrykrank.com
You'll probably need wait to receive the gun in order to identity the exact part that needs to be replaced.