what circuit breakers are compatible with eaton gfci , 50 amp, 2 pole breaker?
I doubt you will find one. When looking for acceptable breakers you need breakers to be NRTL (UL, ETL, CSA) recognized, meaning Listed or Classified. Listed are breakers documented in documentation with the panel, Classified are substitute breakers by other manufacturers that have been tested for use in the panels indicated in their documentation. Most manufacturers of breakers don't participate in the Classified process, the exception is Eaton. This chart of Eaton breakers https://www.eaton.com/us/en-us/catalog/electrical-circuit-protection/classified-circuit-breakers.models.html doesn't show any 2-pole gfci breakers, but even if it did I would suspect there is likely little difference between the listed and classified version made by the same manufacturer.
So your only real option for a different breaker would seem to be mounting a small (spa style) disconnect as a subfeed from your main panel.
I would thoroughly check your existing wiring, receptacle, cord, and even the connection in the stove to verify no fault exists between neutral and ground before even considering a different breaker. If you find continuity anywhere between the neutral and ground wires then changing the breaker would be pointless.