I've been listening to all three versions, the studio version included, and they are all distinctly different.
I agree the original Rhapsody sounds like a studio track with audience noise mixed in, but it is a distinctly different vocal take.
On the promo version, Bono sings "Until the clouds unroll and you come down," while on the Rhapsody version he sings "Until the clouds unroll and you come home."
He also adds several lines, starting with "New birth to the rebirth."
There are also horns in the Rhapsody version that are not on the promo version.
I'll most my transcription in the lyrics section so you can compare the differences.
[Edited on 2006-9-28 by Brad]