I just compared “The Last of an Ancient Breed” from the A&M CD to the one that appears on the La-La Land CD. The anomalies I noticed on the La-La Land are present on the A&M as well, and appear to an artifact of the original recording. They're just a little more apparent on the La-La Land because it was mastered just slightly more hot than the A&M. Honestly, I probably just noticed them when listening to the new edition because I was listening for sonic improvements/changes.

Otherwise, the sound is pretty much equivalent, so there would be no advantage to sourcing from the A&M disc for an isolated music track for The Warriors.

As Emily Litella would say, “never mind!”