Over the last year or so I’ve been doing a lot of work with R.J. Stewart’s Sphere of Art ritual. With the Sphere of Art you create a sphere by working with the four elemental archangels. I’ve modified the SOA working to include three additional archangels, one for the underworld, one for the cosmos, and one to tie it altogether. This modification hasn’t been done lightly, but rather has occurred as a result of a careful reading of both the Sphere of Art and works by William G. Gray who references the other three archangels extensively.
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.