I guess you could use variables. So create two variables and save true (1) to variable if artist is found from your specified folder
Save(0,ArtistOnCollection1[Artist])
Save(0,ArtistOnCollection2[Artist])
If(IsEqual([Filename (Path)],Folder1),Save(1,ArtistOnCollection1[Artist]),Save(0,ArtistOnCollection1[Artist]))
If(IsEqual([Filename (Path)],Folder2),Save(1,ArtistOnCollection1[Artist]),Save(0,ArtistOnCollection1[Artist]))
Then compare if row has both locations true
If(IsEqual(Load(ArtistOnCollection1[Artist]),Load(ArtistOnCollection2[Artist])),ON BOTH, NOT ON BOTH)
which can be made as filter or check mark besides row. something like that. above is not actually working and would need some adjustments but idea I guess would work