Are all New Sensor tube brands the same?

I get that they bought the rights to all these classic brands, and that they are making them in an old Russian factory, but like, are they just making tubes on the same line and sticking different labels on them? Is there any difference between a Tung-Sol, Electro-Harmonix, and Mullard? Is there any variation like "binning" high performing tubes into one brand and lower performing tubes into another?