Page count wrong, or multiple versions sharing isbn?

[Ben]

Hello all,
My name is Ben, and I'm a relatively new goodreads librarian. I have encountered an issue I would like some help with before making any edits. I am currently reading A Clash of Kings by George R. R. Martin isbn 9780553381696 paperback edition. Now according to goodreads it has 969 pages, but my copy stops at 761 pages (including appendixes related to the story). I could edit the page number to what my copy says, but I want to be sure that there aren't multiple versions sharing the one isbn. Any help would be appreciated.

[Abcdarian]

WorldCat also has 761 pages; I'd say go ahead and change it.

[Ben]

Thanks, I just thought the discrepancy between 969 and 761 was a bit big. I wanted to be more sure there weren't 2 versions sharing the same isbn. They shouldn't one would think but I'd hate to be wrong and screw up someone's page count I attempted to add an edition but it wouldn't let me due to the isbn already being used.