Just shows the hazards of cross-threading! Same joke; one version has a few more self-referential puns, that's all. Shades of Douglas Hofstadter again! (Just finished reading Le Ton Beau de Marot - all about translation, of poetry, jokes, puns, etc. That's another cross-thread, original thread findable by search, I'm sure.)

Edit: It's is Strange Loops, not suprisingly, located at

http://wordsmith.org/board/showthreaded.pl?Cat=&Board=wordplay&Number=64520]
and
http://wordsmith.org/board/showthreaded.pl?Cat=&Board=wordplay&Number=64600]