Different between the 3 pdf files

What is the difference between the 3 pdf?

• complete-book-bookmarked-pdf/deeplearningbook.pdf does not seem to have bookmarks (according to Preview on macOS) but it has working hyperlinks
• complete-book-pdf/deeplearningbook.pdf seems equal to ``complete-book-bookmarked-pdf/deeplearningbook.pdf
• complete-book-pdf/Ian Goodfellow, Yoshua Bengio, Aaron Courville - Deep Learning (2017, MIT) seems equal to the other two but with no hyperlinks working. Interestingly, it's a little bigger in size. All 3 pdf files have 800 pages, not sure if the content is exactly the same or if some include some corrections.