Ottoman Empire and the Abbasid Empire appeared in the same region in different time with different origins.
Explanation:
The Abbasid empire was
-a caliphate. It was directly after the line of succession from Muhammad that this empire lay its claim as the third caliphate.
-it came out of the Saudi Arabian area as other caliphates and was responsible for the expansion of territory in the name of Islam.
- it was an empire that stretched long into Africa and to Asia proper.
-dissolved by 16th century.
The Ottoman Empire
-it began in the region of Anatolia or modern day Turkey.
-It began in 14th century.
-It was Islamic but was not associated with the Caliphate. It took over the land of the Caliphate when it was dissolved.