MK122LL/A vs MK122B/A?

Is the extension cable MK122LL/A compatible with a 2017 touchbar 15" macbook pro (87w) or do I need to purchase this particular extension cable (I believe it is MK122B/A?)? I am confused because all other retailers selling apple extension cables only sell MK122LL/A, which does not state 87W in the description, rather "Use it with MagSafe and MagSafe 2 adapters and 10W, 12W, and 29W USB power adapters." Thanks.

Power Adapter Extension Cable

Power Adapter Extension Cable

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