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What is the difference between With optional Type XVIII to Type XXI conversion??
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This simply mods your XVIII to behave like an XXI. The XXI does not have a Walter drive, but does have greatly increased battery endurance, and a high underwater top speed compared to other uboats, tho slower than the XVIII is in game with the Walter turbine enabled. Note that the XVIII was never actually completed in real life, but was dropped in favor of the XXI.
The IXD2 does not come with a Walter turbine, it was a regular uboat with diesel engines and an electric motor powered by batteries. I am not aware of any mods for the game that add the Walter turbine to the IXD2.