In the Nyktelios post (paraphrasing the arguments I set forth here) I made the following comparison:

… much as the Egyptian solar deity Rē fuses with Osiris in the Duat.

I discussed the question of whether Dionysos = Osiris in the piece Mighty Bull of the Two Lands, however it wasn’t until this article that I came to a satisfactory solution. (At least for myself.)

It takes time to put the pieces together, and in true bricolage fashion the story changes depending on how you arrange them.