But it's not likely actually that.

We all know that CAT cables are sets of twisted pairs of wires where the rate of twists per inch is different for each of the four pairs in order to minimize crosstalk from one pair to any other. So all CAT cables are the same.

But I've seen different models of wire where which color is twistiest, which is least, etc, is not the same as with another model or brand of wire. (I'm finding this hard to express in a simple clear way.) The four pairs do not all carry exactly the same information as one another, so the performance of the cable will vary in some way from model to model, because of which pairs get which parts of the signal.

This means it's possible that the particular wire that you use has rates of twist that work better with 568B than with 568A, but another brand or model of wire might not.

Note that cables are usually specced for a 100 meter length, meaning every pair will function properly at that distance. Any differences due to twist rate should not show up over distances significantly below the spec limit.

Incidentally, it makes sense that a wire manufacturer, having once chosen which colors to twist how much, will keep setting up their manufacturing process using the same rates of twist for the same colors as last time they ran this model.

All this means it totally makes sense that once you've settled on a brand and model, you can expect performance to be the same with that wire, but don't assume wire from other manufacturers will perform the same.