Okay, after some investigation of my own, yes, SCUMM Revisited does work on Grim Fandango Remastered. But despite claims that the entire soundtrack was re-recorded, it sounds like a lot of it is exactly the same as the original. I think they re-recorded some tracks, and others seem to be using a higher quality, or at least a different synth than the original, but there's also a lot that they left exactly the same. Maybe they mostly brought the orchestra in for the cutscenes?
"So Brak, is that Polish? Or... no I suppose it wouldn't be."
--Mike Nelson- MST3K: the Movie