It's impossible to tell the size of their heads from the pictures; however, when the two different pictures are made the same size and merged you can see that everything matches except the jaw line at the side (including the way the widow's peak leans slightly over to one side on both of them.)
True, the lower half of the face is thinner on Azmath. He might have lost 15 pounds or so and 5 o'clock shadow might make him look thinner there.
I have to agree I am concerned about the lower jaw and the upper lip.
1. Ayub Khan, 2. Mohammed Azmath, --3.Azmath/Doe ---4. John Doe #2