It would be helpful if page navigation in one document could be matched in the other when comparing two documents side-by-side, i.e., when comparing two versions of a document.

As it is, it's necessary to navigate, i.e., page-down, in one document then click on the other document and repeat the navigation. As there's no key command to switch tabs/documents/windows either, it's even more unproductive.

Having the option to make the other document in the 2-up arrangement match navigation would improve productivity greatly.