This is what you hear:
A section of Us and Them from the original 1973 record
The same section of Us and Them from the 2003 reissue
Transition of Speak to Me to Breathe from the 1973 record
Same transition on the 2003 record
Also, I noticed the tempo on the vocal echoes of Us and Them is slightly off on the 1973 version. The sound quality is also a bit clearer on the 2003 version. However, I prefer the 1973 version.
I have the SQ Quad mix and the first versions sound like the QUad mix
capitolemiproducer 1 year ago