Dude, the 1972 two-fer (and the Polydor vinyl from the same time) contains a remix, not the original 1969 mix as prepared by Barber. It was probably the band's then-engineer Johnny Sandlin who did this remix. He may have felt the original was much too congested sounding because the 1972 mix is much more dynamic with hardly any compression on any of the elements (but not necessarily better for it). One of its notable differences is the absence of the coda of My Cross To Bear.
Anyway, the remix was the version used for most any reissue since, except for the 1997 CD remaster on Capricorn (remastered by Suha Gur) and this new edition on MOFI. They have done the right thing by choosing this version because, well... it really is the correct mix. I suspect this new edition is probably closer to what's on the mastertapes, but somehow my Yellow Atco give me a better feel (and also a bit more top-end, which I think is not a bad thing here).
Lastly, don't forget, there are different pressings w/ different cuttings that could all be considered "original US", among them one by Columbia who cut from an eq'd/compressed copy tape. My 1971 copy has an A-side that was cut by George Piros, and a different softer cutting on the B-side. Hand-written matrices on both sides. The Piros cutting is very nice sounding, but just a bit on the hot side. The B-side plays clean all the way, but has a bit less "impact", so to speak.
EDIT: Listening some more now, and yes, the MOFI is clearly superior to side 2 of my yellow ATCO, which indeed seems to have the highs rolled-off. Not so with side 1 though. Not sure if copies with AT/GP on both sides of the wax exist...