I was recently asked if the Guardians of the watchtowers are the same as Archangels. The reason I was asked is because a lot of Magicians call angels to their circle or the Guardians of the watchtowers. It's a good question to ask, and since I've been doing my own work around the archangels of the quarters, I thought I would answer it.
The short answer is that the Archangels aren't the same as the Guardians of the watchtowers. They are each their own distinctive set of beings. Frater Barrabbas has an excellent book out about this very topic called Spirit Conjuring for Witches: Magical Evocation Simplified (Affiliate link), where he explores this topic in depth.