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John Williamson wrote: "Not unless you have access to the
master tape archives at a studio and the machine used to record
the album or track.

If you do, then you will have all you need to do the comparison.
For some reason, record companies tend not to leave their
masters lying round on the web. "

What I meant was: remasters of albums that sounded closer to the studio masters.
If you cannot rattle off a few then I don't believe they exist.