0:00-1:35 = OST track 14, 0:56-2:25
Another instance where subtle timing variations suggests these two tracks are different takes of the same musical cue.
FYC Track 16: Finn and Poe, United
0:00-1:37 = OST track 15, 1:13-2:51
1:37-2:01 = not in OST
Like so many of these FYC tracks, this one is largely the same as what is heard on the OST except for the coda.
FYC Track 17: The Bombing Run
0:00-2:07 = not in OST
This is a curious track. The music is mostly incidental battle score, though at the very end we get Rey's melody. Also, the title “The Bombing Run” implies that this music accompanies the Resistance's attack on Starkiller base – but the music actually used in that scene corresponds quite clearly to the OST's “Scherzo for X-wings”. So either this FYC track was not used in the film, or the title is misleading and the audio is heard elsewhere. There are several places where the latter could prove true: My best guess is at 101 minutes (after the Falcon arrives at Starkiller base but before Han's death), though it could also be at 112 minutes (after Han's death but before the lightsaber duel with Kylo Ren), or at 89 minutes (I don't remember what's happening plot-wise at that point, but we do hear Rey's melody).
FYC Track 18: On the Inside
0:00-0:45 = not used in OST
Since it's mostly incidental (no prominent themes or motives), it's very difficult to precisely place where this music is heard in the film – if it's even heard at all.
0:45-2:41 = OST track 18, 0:02-1:59
Another instance where there are subtle differences (see FYC 1:49 compared to OST 1:11), but they're similar enough that they're clearly comparable. And once again they appear to be different takes of the same musical cue, with one being a revision of the other.
2:41- = not in OST
It's yet another example where the very end is different from what's found on the OST.
FYC Track 19: Torn Apart
0:00-0:49 = OST track 19, 0:00-0:35, 0:59-1:19
Yet again, subtle timing differences imply that these two tracks are two different takes of the same cue – and that one is a revision of the other to accommodate the film's timing. Impossible to tell it is which is which.
0:49-1:08 = not in OST
Sad incidental scoring. Judging from what is heard immediately before and after, this is the precise point in the film when Ren murders Han. The question is: Which of the two soundtracks is actually used at this point. Something to pay close attention to during future viewings.
1:08-2:26 = OST track 19, 1:33-2:47
2:26-2:33 = not in OST
A few extra seconds are included here as compared to the OST. Once again, one of these tracks is probably a revision of the other to coordinate with the film's timing.
2:33-2:44 = OST track 19, 2:47-2:58
2:44-3:05 = not in OST
Again, a few extra seconds in this version.
3:05-3:25 = OST track 19, 3:32-3:52
3:25-3:48 = not in OST
Yet again, a few extra seconds in this version.
3:48-4:24 = OST track 19, 3:52-4:19
FYC Track 20: The Ways of the Force
0:00-0:13 = OST track 21, 0:00-0:13
0:13-0:19 = OST track 21, 0:21-0:27
0:19-0:38 = not in OST
There are similarities to OST track 21, but I can't call them comparable.
0:38-1:03 = OST track 21, 0:31-0:55
1:03-1:21 = not in OST
Again, similar to OST track 21, but I can't call them comparable.
1:21-3:58 = OST track 20, 0:46-3:16
Minor difference in timing imply that these two tracks are different recordings of the same musical cue.
FYC Track 21: The Journey Home
0:00-2:18 = OST track 22, 0:00-2:05
Slight differences in timing, and the coda of the FYC track is a little different.