The C-47 was actually the DC-2, which was a slightly smaller aircraft.
Hi Elvis, again.
I get a different story from Yenne's "A Tale of Two Giants" (McDonnell Douglas).
The...
C-32
C-33 (One had a DC-3 tail, called the DC-2 and 1/2)
C-34
C-38
C-39
C-41
C-42
..were all commercial or military versions of the DC-2
The...
C-47
C-48
C-49
C-50
C-51
C-52
C-53
C-68
C-84
...were all commercial or military versions derived from the DC-3 airframe. The difference between the C-47 and DC-3 principally involved a lack of carpeting, soundproofing and interior detail. The door size was more than doubled which required structural strengthening. The C-47A upgraded to 24 volts to accommodate a conveyor-belt motor.
(Incidentally - small world, the C-44 was a Bf-108.)