Gearbox swapping

Hi everybody, I've already made one ricket with this, (posted it in the wrong place), but I would like to know if an Lt77 gearbox with transfer box could be replaced with an R380 ditto into a D1 200tdi. The answer may not be so simple as it sounds; I well remember the trouble I had replacing the ATF in my old 300tdi 'box because of the lack of space between floor/tunnel and gearbox. This 200tdi (with LT77) has a lot of room in the same area, but would this automatically give me similar working space if I fitted an R380? Are the floor pans any different between 1993 and 1998? I might be concerned over a non-existent problem, but I have nowhere else to ask the question. I've tried the obvious and got nowhere. I would be grateful for contact with the real world!