Indeed sounds unlikely, given that that the R&R version was released in 2017, whereas the GOG version, to the best of my knowledge, hasn't changed since 2014.
2016 as per GOGDB, but that doesn't mean too much either (and that is even if it is accurate). I never really did look into what the "Remaster" all entailed before. At the very least it does seem like some compatibility fixes, a new splash screen and some steam non-sense, otherwise it is exactly the same.
"The Bard's Tale Remastered & Resnarkled features the following updates:
Updated splash screen and app icon.
Runs at highest desktop resolution by default without bringing up the Graphics settings app.
Graphics settings app updated to no longer incorporate legacy language settings. Instead, the Steam specified language is used which is the preferred method.
Full Steam overlay support (Shift + Tab).
Steam achievements & trading cards.
Additional language support for Italian.
64 bit OS’s no longer crash at startup."
So, it might be possible we have what really matters with GOG's version already, the crash fix on 64 bit and the resolution updates. Should really take a look sometime soon and make sure, but it really is viable concerning those fixes. Seems like the Remastered & Resnarkled was just a marketing ploy to bring more attention to the game on Steam for a short duration. I would say that if the crash fix and resolution updates are present then there really is nothing of value lost other than perhaps the Italian language support for those who would need it.