Yes, it's an amalgam, but certain elements stand out more than others. The minarets are of the fancier Egyptian variety rather than the square towers used in the Maghrib. Agrabah is full of domed buildings, whereas tiled pyramidal roofs, not domes, are the preferred kind of superstructure in Morocco.I just see Agrabah as the most generically Arabian pastiche possible. It's a hodgepodge of impossible minarets, onion domes, and horseshoe arches. Not that I'm arguing you're wrong, especially considering that it's contextualized by the story itself, but I'm not sure I'd bother placing most of the architecture geographically considering how much of an amalgam it is.
"Arabian" (which historically meant "Arab" but today refers to the Arabian Peninsula) is too specific a description of what's going on in Agrabah. Many of its architectural references are Persian (i.e., non-Arab), and there is even, as I noted earlier, a strong Indian influence, particularly in the sultan's palace.