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568A was pushed by the off-shore manufactureres so their two pair telephone sets would x-connect straight. The IT types loved that as one patch panel could do data and voice.
If your terminating to a patch panel then it doesn't matter a two pair will work fine on either scheme .

so the same patch panel always will do two pair a or b

it only becomes a issue if your terminating one end to a block

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Serving SW and West central Fl since 1984