Most of your Civilian DC-3's had the passenger door on the right of the Aircraft as they were ordered that way. Believe both American and Eastern ordered theirs this way. Some early DC-3's also had a passenger door on the left side.Were not the side doors different on the civilian planes? Are Jeeps the same too?
The C-47 had the double cargo door installed on the left side. These aircraft were also different by having a heavier floor structure and heavier Gear to support the increase in aircraft load weight.