4.) Both books begin and end with the same things, apart from some distinctive things like a biography of imam an-Nawawi in the Dar al-Fajr version and scans from the handwritten copy of the book in the Dar al-Minhaj version.
To end: there are more versions of this magnificent book. One of these versions is the one by Dar al-Bayan at-Turath which can be downloaded here: -adzkar-al-muntakhabah-min-kalami.html This version has 533 pages. Still less than the Dar al-Minhaj version. And there is the version by Dar Ibn Hazm which contains 741 pages (See here: =view&item=0782).
An easy method to understand it, would be to download a copy of al-Azkar in .doc format, then play around with the borders, fonts and font size.
Rest-assured, you would be surprised at the difference it causes.