One difference is the chrome that surrounds the vent window. If you look at the top, you will see that the convertible is more squared off while the hard top is curved at the top. You can put the hardtop vent window chome on the convertible door. The easiest way is to just swap the entire vent window assembly which include the front window track. But you could also take the vent window assembly apart and put the hard top chrome on the convertble vent window.
Another difference is a little spring loaded thinging inside the jam at the rear of the door. The hard top would not have this piece and instead of holes there would just be two little dimples in the sheet metal.
Those are the only differences I'm aware of.
