This is a custom Mandalorian. He has a jet pack.
This is a close-up on the helmets design. It is like a T.
This is comparing it to a regular clone. The coloring is completely different.
Here is the back. One has a jet pack, one doesn't.
The fins are different. The Mandalorian's fin is only 3/4 of it(the point is missing).
The helmet designs are different too. One is complete, the other is missing the "fork".