What breakers are compatible with GE panel?
In respect to this, are GE and Eaton breakers interchangeable?
Not all of the "so called" interchangeable breakers are U.L. Listed to be interchanged. Not all breakers are interchangeable; there are many many types of breakers including bolt-in breakers. When it comes to plug-in breakers, Square D QO and Cutler-Hammer CH and a few others will not physically fit other panels.
Similarly, will a Murray breaker fit in a GE panel?
Nail-on GE breakers might work too. There are no breakers acceptable for use in a Murray panel. The Murray panel is, in itself, totally unacceptable.
The circuit load will determine the breaker size you need – and you'll need to make sure to get the right brand, as all breakers are not interchangeable. Brand: Always install the correct brand of breakers in your breaker panel. While some breakers are interchangeable, many are not, even if they look the same.