Agree with the above post. You need to get the specs on each component to see. In your case it may be more than 1. For me, I own a Ford Excursion which is a 3/4 ton truck based on the F250/350 platform. Although the frames are not identical, they are similar. The other parts, including engine, transmission, axles, brakes, etc. are all the same. The "main" difference is the suspension. It has SUV springs for general ride comfort. There may be other differences I am not aware of.
General good rule of thumb is: You got what you got, it is what it is, it's not what it's not and most importantly..........It will never be what it's not.