PeterD writes:
AFAIK, both are exactly the same electrically, only the polarity of
the wires (vis-a-vis color codes) is different. Were you to wire B to
B or A to A it is straight through. Wire A to B then it is a
cross-over.

Actually, not at all. Swapping green and orange swap whole pairs, not
swap wires within each pair.

I think the difference is in the number of twists per foot in the
green and orange pairs (orange has more). If the TPF match the blue
or brown pairs, you get more crosstalk, so using the correct pairs may
result in less crosstalk.