I see Generac sells a 60 amp double-pole circuit breaker (CB).

Q: Can I swap the 60 amp CB for the 50 amp to get use of the full 15 kW from one power outlet?

Q: Also, does the backfeed CB on my panel have to be a double-pole, double throw (DPDT), like the one on the genset?

I see some gensets having a DPDT, while others have a DPST (Single throw) for the 240v power source.
Q: Why the difference from generator to generator?