Astral Projection vs. Astral Window

[Hellboy]

Is the only difference between these two spells the risk of getting caught that comes with Astral Projection?

[Tyrant]

As far as i can tell that is the only dif.

[Hellboy]

I figured but I just had to check - thanks!

[Hellboy]

Oh, one more question:

Do domes prevent scrying via either of these two spells?

[Wish]

only if they are up before the spell. (they block all incoming spells, whether its scrying, or teleportation, or what have you.)