Close Steve, but not quite (don't you hate that...
). All of the 6 window aircraft have the baggage door on the aircraft left, and also have direct access to the baggage compartment, bucket back seats, battery in the nose, and the baggage door doubles as an emergency exit, openable from the inside regardless of weather it is locked on the outside or not. Only the 63-65 models were 4 window birds, and their interior reflected the same layout as the 4 window singles of the day.
Realy, in todays market, there is not much difference between a B and a C if the B has been converted to Alternators and has an upgraded panel with a std T layout. Yes the C has the thicker stab, but I haven't noticed any difference in flight between the two, except possibly a few knots in speed, but that is hard to track as there are so many airframe variables. The only thing I did notice is that ice doesn't build as fast on the larger radius tail feathers, but I never had controllability issues with the thin tail in ice either, even though it looked ugly!
-Zach