The topic of twist rates came up a couple of years ago when it occurred to me that it one colored pair always has a higher twist rate than the others, then it would make sense to use that pair for higher frequency signals. I asked if all brands had the same relative twist rates.

After a lot of speculation here, Stephen Lampert of Belden jumped in to say that the spec did not say which colors should have which twist rate, and each manufacturer probably always did it their same way each time, but since it's not part of the spec, you can't trust that the twist rates will be the same from brand to brand.