I've adapted the temple spell lists from Tekumel with some success. It's a bit of an apples to oranges comparison, but hey, it's all fruit.
First level spells from the various traditions a pretty much all the same. There are a few that are missing, pyromancers not having darkness for example, but the everyone learns the "fundamentals of magic".
Sixth level spells are all unique, and there aren't that many of them. The Earth Mother has earthquake and hero's feast, and the pyromancers have firestorm.
Third and fourth are a blend. The war gods share some spells, most of the gods of light share some spell, and so on. About a quarter of the temples / guilds / whatever share a particular spell.
It works for me.