Difference between Kuzma and ZYX

I notice that there is currently no reference to Kuzma cartridges on their website other than the out of production Kuzma reference above mentioned.

Piedpiper is correct. Kuzma's new sourcing arrangement is with ZYX, effective early this year. Before that they did rebadge Shelters, as Rauliruegas said.

Kuzma does not have access to the UNIverse or Atmos, so whatever models they offer are presumably comparable to the Airy 3 or below.

Mapping of Kuzma model to ZYX model is something neither company will discuss, for obvious reasons. The Airy 3 and Airy 2 specs read the same, so judging by price does seem like the only way, short of buying one of each and doing an A/B of course.

The specifications on KC3 is similar to R-1000 Airy 3 so they are probably the same. But what about the KC4 is it the same as the new ZYX 4D?
The price would indicate that.

KC1..... R50 Bloom H
KC2..... R100-02
KC3..... R100FS
KC4..... R1000 Airy3S