Searches indicate these part numbers cross reference on some sites and the pics look identical however Land Rover (and other parts suppliers) indicate one's for the D4/LR4 and the other's for the Range Rover sport. The former part number's quite a bit more expensive than the later. I've encountered this with other parts, unique part numbers to specific model with large price and availability differences, for example a heater pipe I recently purchased from the main dealer had 2 different part numbers and prices depending on model but were identical in hand.

Anyone have experience with these?