Two tracks in question, original album version:
A version that appears on a compilation:
The version that appears on a compilation is only slightly shorter due to a more aggressive fade-out… the recording is no different any other way.
So question, should this be merged into the album version or does this recording stand on it’s own?
Style / Recording - MusicBrainz already covers fades. They’re not considered separate recordings if they don’t “cause the structure of the song to change”
An approx rule is if you can play then at the same time and not spot a difference, then they are the same recording. Faded earlier is still the same recording, just less of it. Compilations often cheat some time off of tracks to gain some extra space on the disk
I find Audacity handy for a visual compare