Scrabble USA is not the same as the euro versions I think its because Hasbro own rights in USA & Canada where as Mattel own the rights for Scrabble in the rest of the world so EA got Hasbro game & Ubisoft got the Mattel version :S
scrabble 2009 Edition is pretty much the same game as the Scrabble 2007 Edition in presentation (ugly) but has an option so u can turn off "vulgar" words appearing in the game,
also it has a texas hold em no limits type game but with letters instead otherwise seemed the same game as 2007 Edition to me, haven't played the game much though tbh
Scrabble USA is presented better in some ways (looks more like recent scrabble u see on pc etc)
unlike the euro version you hold the DS in vertical book style, and instead of playing against cartoon people u play against cute animals it seems, haven't played much of it either
None of the Scrabble DS games have an online option which seems lazy and i think is pretty poor.