Oh Christ. Here we go again...
If you look hard enough, you'll see threads on here discussing the new remasters. Take a THOROUGH look at those and read about the remastering process and "The Loudness Wars".
"Louder" is not better - "quiter" is not worse !
The material for Singles Collection was mastered by Peter Mew, and material for Absolute Greatest - by Bob Ludwig. Two different persons.
I don't like that Singles Collection project has tracks with different loudness level on one CD. Play The Game single for example.