There are no provisions to locate passenger ladder on the right side of this aircraft.
That diagram is just an *example*, what counts is the actual position of the door, which can be on either side. When moving to the other side, you must also rotate it 180 degrees, so the green arrow points on the outside.
Also, your last screenshot of the DC-4 shows is taking data from Simconnect, which is the normal situation when you haven't configured anything yet. In that case, GSX will work somewhat, but doors positions will not be precise.