DUAL ROMS - s3 gt-I9300

hello people,

I wanna know if it possible to install two roms: The last Stock ROM 4.3 and Cyanogenmod 13 ROM...

Which custom Kernel is better? Any guide of instalation? please. I read something with STweaks, but i dont know if it possible with these 2 roms. Any of you could make it ?

I hope your answers guys!