The only difference that I know of is the material in which the two items are constructed from. They were fitted to early V6 models, as well as the other variants.
Early diesel models had a 100 rated cap while other versions were fitted with 140 variant. I would of thought that if the cap was serviceable and in decent working order it shouldn't create a problem.
Secondly, Project Drive could have played a part here, the black version could have been more expensive to produce.
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