they seem very related.. except the Archons are said to have been created in the beginning.
Egregores are strictly a human creation, no?
edit: just a thought..
we can plan what to say/write, we can plan out our day tomorrow, we can even plan out our week, even months and years ahead.. maybe we should plan ahead our afterlife? fascinating! not sure why I was compelled to write this here but it is something to think about.
2nd edit: the legal name! its an egregore! OH $#!^