the difficulty of knowing the original nature of a track (esp re : ardkore/etc) (also : mislabelling)

anyway, with a lot of tracks I'd gotten off slsk/etc previously is what I'd downloaded previously didn't match up to what I was currently downloading. the version of KLF's "Last Train To Trancentral" I'm familiar with eventually turns out to be the "Live From The Lost Continent" version; I'd been listening (& loving) the Dr Trip & Bob's Bolts mix of Shaft's "Roobarb & Custard" thinking it was the original; the version of T99's "Anasthasia" I'm used to is the one with k-ace euro-rapping on it (still don't know what this particular version is called - I downloaded everybody's copy of the track until I found the one w/vox - seven out of eight were instrumentals); & the version of Messiah's "There Is No Law" with the Class Of (19?)99 dialogue at the start after the initial "the messiah for the 21st century!" ("THE YEAR IS 1999. THE GANG CONTROLLED AREAS HAVE BECOME KNOWN AS FREE-FIRE ZONES" etc) is also pretty uncommon - all these slightly inferior versions/mixes abound with no way of telling them from the (blindly downloaded) tracks I've come to love! I still can't find a version of Human Resource's "Dominator" that doesn't sound sluggish & muddy; & for around six months I went around thinking that the edit of the Foul Play remix of Hyper-On Experience's "Lords Of The Null Lines" (off the moving shadow 10th anniversary comp) was, in fact, the original (& labelling it thus on mixtapes, ILM threads, etc).

so - is it just that particular period (obscure/diy-ish limited releases, hasty/sloppy compilations, "big melting pot", "moving-too-fast", etc) + interweb inability to properly label things, to be connected with the "actual" artifacts & so on - um.
had a question.
lost it.
extrapolate, or laugh, or something.