Hehe the sleeve issue could go both ways, imo it's more likely it's the original one tho.
As for what it sounds like, I don't know Underworld well enough, so can't really comment...Only record I got so far. Also hard time describing this shit.
Uploaded both tracks now, thx for the mediafire suggestion but it seemed similar to megaupload so I used my account there. Whatever, that's them:
http://www.megaupload.com/?d=4C7V6K5P
http://www.megaupload.com/?d=QGJMNEYZ