How was the ottoman empire similar to the Austrian empire?
That they united a variety of different peoples, religions and languages under the rule of one nation. Although there was a dominiering culture and language people from all peoples could work for the state and many different languages were in use in daily life as well as in official institutions. Although German an Turkish were the lingua franka. And of course both had a god given emperor, that did not cared much about democraty (austria had a parliament, but that had no power).
After WW I both empires were broken into smaller national states.
Other than the empire of lets say England, these countries had no colonies.