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Doors are the same 48-52 F1-8. The difference as noted by Scotty is the lock pin on the vent window handle. Some have it, some don't. Not enough to worry about in the big picture.
I still have the door you want if we can figure a way to get it from my house to yours.
When I was looking for a vent window for my 52 and parts to repair it I found the latches and pivots are different.
The vent windows as a unit will interchange but the individual parts will not. You can't use 51 and 52 upper pivots on a 48-50 frame. The latches on the 48-50 do not have the button the 51-52 has either.
I found this out when I realized the PO of my truck "tried" to interchange pivots and latches and it just didn't work.