Thanks for the answer! Exhaustive. As I understand it, this is a gen case production technology. It is unlikely that rep case will be produced in this way, I suppose it will be ordinary sandblasting. The difference in color of titanium can only be achieved with an oxide film, the thicker it is, the darker. Perhaps, with this method, under the influence of various factors, it becomes thicker and darker than with mechanical processing. But I suppose this difference is not significant, and during operation both cases with different technologies will be approximately equal in tone. The question is about the texture required, but I also see it pretty close.
Perhaps technologists working with metals will correct or supplement me.