Hi, The only difference to the door shells is the series 2 has a series of holes for the side trims, but they can be welded up carefully. The window frames are appointed differently but but are interchangeable in the shells.
Hi, dont forget the "anti burst device" (as I did when I shifted a rotten series 2 door for a series 1). I had to cut out that part of the series 2 door and weld the "anti burst" to the series 1 door. I dont think You will have the same problem as I had (The series 1 door "jammed" with the anti burst on my series 2 car) but it is still a different look.