What's up with these new rotors?

TrailBeast said

Can't do that.
I need the new race that came with the new bearing in there.
I have the time and patience for a mountain if that's what I need to do to be sure of my mole hill quality.:D

I would agree with @YY1 normally, but it isn't 30 years ago when we could count on manufacturers and suppliers to not throw the cheapest parts into things just so their prices can be a little lower than the next place.

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So you are knocking out a chinese bearing to replace it with a chinese bearing? The tolerances between manufacturers today is negligible. As a cerified technician i have been repacking bearings for nearly 40 years, less now of course. Never ever a problem with mis-matching bearing manufacturers.
And back in my parts days there were times when cup and cones had to be mis-matched simply due to availability.
Be it on heavy equipment or light trailers, there is really no difference.