I think it’s new compositions. The orchestra sounds much smaller than in the ‘Star Wars’ sessions they use in that drama. Granted, they do use some interesting alternates of some cues (plus Take 20 of main title, for some reason), but considering how far along in production ‘A New Hope’ was during the sessions in comparison to ‘Empire Strikes Back’, I can’t imagine that beyond some nips and tucks here or there that there was nearly as much cut footage as there clearly was during the ‘Empire Strikes Back’ sessions. Thus, no place for the music in that clip.