The Star Wars one uses the cover of the first issue, but the actual content extend through the entire movie. Besides that, I assume they're exact reprints (or pretty close). Actually, and I've only opened Star Wars so far, but the Marvel logo and the price that are shown on the box cover are replaced by the Dark Horse Logo, as well as replacing the green Marvel Comics Group bar across the top with Dark Horse Comics. And the Comics Code Authority logo is gone as well.

EDIT: And the barcode is replaced by a Lucas Books logo.