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add_cat function calls get_or_create, which mean if your database has the same entry with name match, then just return the instance, otherwise create one. It returns a tuple. First element is the instance, second element is a boolean which indicates whether the result is a creation of new instance or not.
add_page on the other hand, calls get_or_create as well as save, but it goes with the logic that add_page needs. The save in add_page means:
“I have this page now, regardless if it’s a new page or an existing page, but I’m going to update the url and the views on it and save the result”. add_cat only need to create Category, not updating anything. Every time you update an existing instance, you need to call save to save the changes.
Check django doc about get_or_create, it explains everything you need to know.