Basically are the TDi ones any different ratio to the petrol trasnfer boxes. I know the gear boxes are but dont know about the transfer boxes?
There are just the three normal ratios on the LT230 :
1.2:1 - Range Rover / Discovery
1.4:1 - LR 90
1.6:1 - LR 110
As you say, there are differences in the gearboxes depending on a few things.
Pretty sure the B/W transfer box is around the 1.2 mark as well, so I can't see any big issues.