Is this possible with Audacity? If so, how?

So basically I have two tracks. They’re of the same song but one is a long version and the other is a short version. Version A is longer and has a single singer while Version B is shorter and has a choir. I’d like to combine the two tracks together to mix the choir and singer as I feel the choir kinda gets drowned out by the Orchestra and the Orchestra is pretty strong in the singer only version. The tracks are pretty similar. The singing seems to be almost beat for beat but the orchestra movements are different. I don’t think there’s a way I can get the Orchestra to sync up right but because the singing seems on point - I was wondering if there was some way I could somehow “extract” the singer from the orchestra. It’s one track so I know it’ll be impossible to eliminate the orchestra and be left purely with the singer. Is there anything I can do?

If it’s a stereo track, you could try the techniques suggested here: Tutorial - Vocal Removal and Isolation - Audacity Manual