Different mix is different recording
If it was a new mix, you would not hear the same thing. For example the bass could be more prominent and the percussions could be less than before. Or they could have put another take of the guitar solo, etc.
Remaster is same recording
If it just sounds “louder”, it’s just a remaster.
Missing stuff is different recording
On your picture, there is a 4 second shorter fade out? Does this cut remove an outro solo or another significant sound? If not, we could maybe ignore this relatively short difference.