I don't think there is any "rule" if they remaster single songs and albums, what has to be adjusted to what.
I guess the strategy is, to give an album or a compilation a certain "sound", that goes right through the album from beginning to end. So that some songs for example do not "drown in bass" while others sound very thin. No matter from what time or album they origin.
Sadly in recent years the only difference between several remasters of the same stuff were mainly in the EQ and compression. You can easily do that yourself with available programms - and of course with a little experience.
But don't expect any miracles when they sell you any more remastered Queen albums.....unless they are newly remixed from the original multitrack-tapes.