I had not heard that intro before, and am grateful for the opportunity. The rest of it does sound like the "usual" demo version though - is this actually another take, or is it just that take 2 is all there is and this is a less edited version of it?
It does make me wonder though - how fast did Roger want to play it????
This was uploaded by John S Stuart originally, who I believe was also responsible for filtering out the tape hiss rather poorly (and intentionally?) hence the swishy sounds.