Generally speaking the bits will fit, with the following warnings
The springs and shocks ratings will be different which may affect ride height and handling, 110's need a stronger axle too.
There were a lot of changes to axles around that period on rr's and defenders and you may find that the bits on the rr may have been changed to make it more complicated. Caliper bolts and width of front radius arms may be different are two things that spring to mind.
If you can I would avoid this swap around, it adds a complication without any real advantages.
If you really want to do it post up some more detail (90/110/v8/200tdi/300tdi/abs/anti roll bars fitted etc)