I think it works alright, not great, but I think it livens up the fight for sure.
It does not work at all. “Battle of the heroes” is a swashbuckler cue with bits of “mickeymousing” composing in it. It so perfectly fits the scene it was composed for that you simply can’t readapt it to something too much different. Vader v Ben in ANH is perfect musicless. Even Lucas did not want to add the Vader’s in SE versions (and it was a close one I guess, since he messed up with leitmotiv in AOTC so much).