I am trying to source replacement items for a 3.0 V6 Diesel in a Jaguar XJ, this particular engine was fitted to a number of JLR products but the reported kW and torque varies quite a bit and it isn't really clear why or what changes to make the difference. The availability and cost of parts varies and sellers are rarely sufficiently knowledgable so I am exploring the potential cross compatibility for obtaining parts. I am particularly keen to obtain low mileage replacement engine and turbo's bacause this is both a sutainable option, it is potentially a cost effective solution (yes there are always risks). What did 'they' change to vary the power of these engines - does anyone know ?

Taken from Wikipedia :-

DIN-rated motive power & torque outputs
180 kW (245 PS; 241 hp), 450 N⋅m (332 lbf⋅ft) Citroën C5, Citroën C6, Peugeot 407, Peugeot 407 Coupé
180 kW (245 PS; 241 hp), 500 N⋅m (369 lbf⋅ft) – Jaguar XF, Land Rover Discovery 4, Range Rover Sport
190 kW (258 PS; 255 hp), 600 N⋅m (443 lbf⋅ft) – Land Rover Discovery 4, Discovery 5, Range Rover Sport
202 kW (275 PS; 271 hp), 600 N⋅m (443 lbf⋅ft) – Jaguar XF, Jaguar XJ, Range Rover
221 kW (300 PS; 296 hp), 700 N⋅m (516 lbf⋅ft) – Jaguar XF, Jaguar XJ, Range Rover Velar, Jaguar F-Pace
225 kW (306 PS; 302 hp), 700 N⋅m (516 lbf⋅ft) – Range Rover Sport, Discovery 5