Very likely true for some, not so easy to spot, though.
There are various recipes, so one Yasaka might resemble a BlueGrip, one Joola might feel close to a BlueStar, and so on. The newest BlueGrip J rubbers are "hybrids of hybrids", mixing BlueStar topsheet with BlueGrip C sponge (while BlueGrip S series uses older sponges of Acuda rubbers).
Chances are there are similar rubbers, but it´s not like in the early Tensor days anymore, when every brand would release their (minimally changed or identical) version of the same recipe at the same time, sometimes at least varying sponge hardnesses or colours, not just names
On the subject, claimed by andro and confirmed by nearly anyone who bought one, NUZN rubbers excel in durability compared to other hybrids