Complete rear subframe, if the damper mounts and spring cones are sound. Check the condition of the short rigid brake pipes on the swing arms.
Bottom mounting rail for the radiator, but I'm not sure if it's the same as the one for the roundnose?
Radiator (again though, not sure it's the same type as for the early ones). Also aircon rad.
Front anti-roll bar.
The complete head with cam, valves, injectors and ECU might make an interesting swap as I understand it will fit straight on to the earlier JTD blocks. The complication would be deleting the DPF control from the software, but I'm sure on of the remapping places would be able to sort that out as many of them sell DPF delete kits.
MAF, but check the part number on it against the one on the early car. They changed type around 2003 and the later ones have an additional sensor wire.
MAP sensor.
Boost control valve (the one mounted by the airbox). Small bore pipes for same.
Turbocharger (definitely that!)
Interior hard plastics for the doors (the bits with the grab handles). Colour is probably different to your early one though.
Shelves for the battery and airbox.
Possibly the front wishbones, but personally I wouldn't bother.
Things like the ABS sensors will almost certainly not have the same connectors as the early one, so not worth the grief of trying to get them out (they'll probably break anyway).