I know there's a certain amount of use of parts between the E body and 71-4 B body... Can anyone tell me if the cowl cap, and/or the inner fenders, and /or rear seat pans are the same between the two?

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.