You have to get knowledgeable on the rotor sizes and know exactly what a NAS lr4 has both front and rear. For example, my lr3 had slightly larger rear rotors. I switched mine to the v6 lr3 gas engine spec that allow a factory 17 to fit. They are probably the same size as the lr3 v6 tdi. So, for the lr4, the euro lr4 with the biggest engine may be the same. But, you still have to find out the actual numbers.
I would go do some digging on the disco3uk forum. You have to be sure also that that caliper is the same size/shape