That is a good find but from my limited research, I don't think those would be an easy match for the Pietta. The screw is on the side and 2 or 3 piece on the ones I have seen for Pietta.
That one should be good for the Uberti and maybe even the colts and maybe the Uberti confederate versions.
Still waiting on my package from Taylor for my unfinished wood replacement grips for Pietta.
The plain wood just seems period correct and I have always like the feel of them.