It has been said by Dave, and by Meghan, that the Hedge is in the Astral Barrier. So the path of the Mage to the Astral and the Changeling to the Dreams are so similar.
By order:
Astral Barrier - Which Mage go through spending a mana. Here is Hedge and Faerie.
Anima Mundi.

As for the symbolic overlap, it would not be very different from the overlap between Underworld and Stygia. The Supernal Worlds are the way of seeing the Symbols of universe, not of places, and it makes sense that some places in the Fallen Worlds are so...