Not necessarily. There could be things that neither FCC nor California government can legally do. I am not sure whether regulating the Internet by introducing N

Not necessarily. There could be things that neither FCC nor California government can legally do. I am not sure whether regulating the Internet by introducing NN is among them (given the whole "interstate commerce" thing and how broadly it is treated, you'd need a good lawyer to figure it out) but it's not impossible on the face of it, and it's not both sides of the same argument - in fact, it seems to be the same argument from the start: The FCC's recent repeal of federal rules said that states aren't allowed to impose net neutrality rules, and FCC Chairman Ajit Pai called California's net neutrality bill "illegal." So Pai argued from the start that states can not impose NN, and continues to do so. I guess we'll eventually see if he's correct or not, probably as the case eventually gets to SCOTUS (or the Congress clarifies it by legislation, which probably won't happen).