The mechanical parts are the same but the sensors are different. Make sense since one runs on the lucas electric and the other on bosch electrics.
 
Really?
Mine is a MY2000 THOR engined car and the official LR build document says 2-pin diff.

It should have been 4 pin to deal with the stresses of the 4 wheel traction control but 2 pin Thor models have been on here before. There was a big debate (read argument) about it once. Hard to know if it was Land Rover using up old parts or something a previous owner had done.
 

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