Use whatever color you want, but on the TC at least, the fiberglass part of the window frame was originally black satin.
All my 14 doors are in the original colour of the outside. You can normally tell the original colour behind the chassis plate in the plenum chamber by drilling the 4 pop rivets off.
I have no doors with any colour than the original, anywhere on the doors.
Normally a different colour on any part of the door means they have been resprayed in a different colour, or the door comes off another car, which is easy to tell as the chassis number is scraped into the flat top bit of each door, so they are matched to the shell early in the production line.
Strangely the people who spray my car worked in the Lotus body shop; one made the doors, the other painted the shells, and they asked if I wanted the inside of the doors painted black. It may have happened, but I have seen no evidence on 2520R, 3089R, 3755R, 4129R, 4259R, 4483R and 4688R, with the last 3 being the latest export spec,with the map box on the engine bulkhead, and the engine cover strut supports, and the cloth trim to the seat squabs and seat backs.