I think that a personal anarchism is a tool for a collective anarchism. In that way, an individualist anarchism thought go through the the collective as an additional and repairing tool. It means that from each “x” factor that is included in a collective anarchism thought line, the individual/personal anarchism is present.
E.G.: at the libertarian way of thinking you’ll see underlined that the individual rights should be something never taken by the state or any other monopolizing system formed in society.
This is something that reaches the collective but was planned on the individualism. It’s a mutual relation, you can’t fight for individual rights just because it is a personal advantage, but because it is a human right an something that should be worked on the now-free society.
Also, an individual/existential anarchism which goes alone, without a collective anarchism is such an egoist thought. If you separate them and leave it singular, both have non-sense, cause it’s mutual, as is anarchism.