We know how many pages the English version has? Because you actually may end up, most often than not, with a lower page count when translating from Spanish to English.

Word for word that may be the case but they can add artwork, short stories, and just general layout of book could make it a lot larger of a book if you go by page count. They could also be revamping or betterclarifying the game mechanics to be (ideally) better then original (if what reviews suggest of original)