In a similar fashion, some of the 2005 era songs that appeared on samplers in Italy have less compressed mastering on those.
The most noticeable example I found was "Those Were The Days (Gigi Dag & Luca Noise)". On "DJ Zone 17 - Dance Session 07", the track has around 2.6dB more dynamic range and looks like it's completely uncompressed. I also has a slightly longer fadeout and such.
And I hope on one of these that hasn't been found/added to discogs yet we will one day find the full "Pathos" version of that track that made it to "Discoparade Winter 2005". :P