He's right. The first CD release was a straight transfer off the original master with no alteration. The newer stereo box supposedly has some tiny edits to remove little clicks and bumps (but I'll be darned if I can notice any of those fixes.) The bigger difference is that the dynamic range is more compressed in the stereo box than the original release. It isn't a lot of compression. There is no reason to buy the other mastering if you have one of them already.
Greetings:
I have uncovered some information suggesting that at least some of
the 1987 Beatle transfers to CD might not have been as "flat" as we
were led to believe.
Following is a link to DR Database analysis of a needle-drop of
the 1969 English vinyl LP release of Abbey Road:
http://dr.loudness-war.info/album/view/107500
And next is a link to DR Database analysis of CDP 7 46446 2, the
1987 CD release of Abbey Road:
http://dr.loudness-war.info/album/view/35470
As can be seen, there is more than just one dB difference
between the total & track dynamic ranges of the 1987 CD
and those of the aforementioned 1969 vinyl LP.
I verified the stats for the 1987 CD myself in Foobar2000,
which likely was used for the analysis of that CD in the
DR Database, and probably for the early vinyl LP.
This would suggest that some processing(dynamics, EQ)
was applied during the transfer to the highly anticipated
CD collection of the Beatles in 1987. Again, differences of
1 dB or less between the CD and the LP can be disregarded.
But the difference in this Abbey Road case(DR10 for the CD
vs DR13 for the English vinyl) is cause for alarm -
and disappointment. It means that what is on the 1987 CD
does not sound exactly like what was released on LP 18
years prior.
Happily this was not the case with the first release on CD
of "Sgt. Pepper's": A couple tracks on that CD score
slightly
more dynamic than the original vinyl, again, by
1dB DR value, so it is probably insignificant, and positively
indicative of a truly *flat* transfer* of that album to CD.