Yep, that's Jimmie Stewart, former Colonel, 8th USAAF and B-24 pilot. Now I know which 'Thunderbird' Mustang - I originally thought it was the USAF display team !
The Heinkel conversion also requires slightly different cockpit interior, main canopy, dorsal and ventral canopies/gondolas, and a few other small mods. They were used for parachute training, and also as target tugs, so some external additions might also be needed, in the form of drogue pods, wire deflectors etc. The transport versions, and V.I.P, models, also had a totally different cockpit layout, and a side door, with an extensively modified interior.
Those used in the 'BoB' movie (one still at DX under restoration) were the closest to the normal bomber configuration, being mainly converted to para and target towing duties, but retaining the 'standard' bomber fit, including the bomb bay cells.