Yeah, a huge thanks to Dave! ... & to John for assisting!
I listened with my daughter Emma (13 years old) and she "nailed" it instantly on the "difference". I heard it the same way too but it took me several repeated evaluations (since I'm an enginerd) to confirm my hearing...
I also listened separately on my two systems and "things" sounded quite differently but with the same results...
For those who have not listened yet & are not familiar with this Pink Floyd CD, I suggest using Tracks 2,4, 10 & 11... these all have some different sonic goodies to evaluate and it may be easier to "listen / focus" with these suggested tracks.
My $0.02,
Pete