Unless you own a large multi-faceted workshop it is not really possible. If you have a workshop then you can probably afford to pay a electronics computer keeek to build you a dedicated stand alone ECU to run the engine.
If you were going to do it yourself, you would need to buy a wrecked D3/RRS and pull all the wiring and ECUs etc out of it and after doing the same put the D3 stuff into the D2. There will be issues of compatibilty eg sensors on the tfr case and how it operates are completely different.
A guy in the UK is putting a TDV8 into a D3 and had to do that but the donor car and the recipient vehicle are similar (RRS to D3)
If you can design and build ECUs then might be a goer as has been done in the UK with a TDV6 into a Defender.
D3s are now relatively cheap - sell the D2 and buy a D3
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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