Mario,
there's "something sacred" about RG6 versus RG59, by which I mean they do not perform the same way. These are inherent differences.

When I say there's nothing sacred about the wire colors of a CAT cable, I mean there is nothing inherent in the different colored pairs. They will all function the same, within a range of functions. IT's a range due to different pair twisting rates, which are not predictable or determined by wire color except for each particular model -- and even that is not a spec, it's just a manufacturing habit to meet the actual spec of "different" by some defined performance spec.

You know the word "nominal"? It comes from the same root as "noun" and "name." It means "it's what we call it." The wire colors are nominally different because 568A and B spell out, for the sake of conformity and for the next guy coming along to work on the system, which color goes where. There's nothing sacred about the wire colors. It's just handy to always do them the same.

Always having blue and brown is no big whoop, as blue and orange are the first two pairs of telephone multipair cable color code. So you have to decide whether you want to use a color coding that matches two pairs of data or two pairs of phone. You can't do both.