There is just enough difference , (that is on my two examples ) to say no not interchangeable,
but that is not fair as the S&B is a Pietta and the Remy is a Uberti Forge Frame Conversion circa both date coded 2008.
Edit, in a further investigation, I went to VTI's parts page where they list two different part number's and price points for the
Pietta Remy VS Pietta R&B grip panels.
Not perhaps scientific, like actually trying ... but if some one has a spare set of Pietta Remy 58 / NMA 63 grips panels to send, I'll be glad to see how close.