For those who have read a story by Card called "Space Boy" in the Escape from Earth anthology, yes, this is the exact same story. I exchanged emails with the publisher and they confirmed this, letting me know that the reason there are more pages in this version is due to a difference in print size and the addition of illustrations; there are no changes to the text of the story. So, if you're looking for a nicely bound, illustrated, stand-alone copy of Card's story to add to your collection, this is the one to purchase. Otherwise, if you're only interested in stories that you haven't already read, and you've already read the Escape from Earth anthology, you can skip this one.
P.S. If you're looking for the Escape from Earth anthology, there are a bunch of used copies right here for less than $5. The anthology is edited by Jack Dann and Gardner Dozois, and the full title of the book is "Escape From Earth New Adventures in Space."