I've got these pictures as well, most are of German officers. Their names are listed in the captions in the Lepre book. Some are Muslims, you are correct.
7 out of 9 pictures have Muslim soldiers with fezzes on. 5 out of 9 have many Muslim soldiers. There are a lot more Muslims in the 9 photos than Germans. Germans don't get down on prayer mats and they don't wear a fez.