Didn't all of the diesel trucks come with hydro-boost setup? Looks like a standard vacuum booster in the picture. You may have trouble ever getting enough vacuum to operate the breaks with that booster.
No, plenty of dodge trucks with diesel engines left the factory with vacuum brake boosters. Hydro boost didn't actually start until the 97 model year. I have a 96 (son's project truck) and a 97 (my truck), both extended cab, 4x4 , nv4500 trucks, the only real mechanical difference between them is the 96 has a vacuum booster and the 97 is hydro boost.