@liztai I'm not going to argue that these (or any) are objective, mechanically evaluatable categories.
But there are clear conditions by which human judgement can distinguish the two, informed by context of power relationships, patterns of harm and risk, who the state is and who its enemies are, etc. by which reasonable people should usually come to the same conclusion whether something is censorship or moderation (by the above definitions), regardless of whether they agree with it being done.