Mislabeled Dune edition? (Incorrect page numbers)

[Lucas]

I own and have read edition with ISBN 9780441013593 but its page count does not match the copy here on Goodreads: https://www.goodreads.com/book/show/3...

My edition has 687 pages (617 if you don't count the appendixes), not the documented 884.

I believe the 884 comes from the smaller mass paperback editions with the same covers. My edition has larger, and therefore not as many, pages.

I, however, own the corresponding smaller edition of Dune Messiah. See attached photo comparing the two sizes: https://imgur.com/S01bjvM