You mean like, "assembled from two separate components"?
More like, they are two separate components, with some interwiring. Components, which we might also call organs. Two of them.
My objection is with the word "organs", which for everyone except maybe biologists and doctors (depending on the specialist definition of "organ") connote the developed piece of machinery inside a living thing. Not the transient state while it's still gestating.
Organs are all interconnected as well. The hind brain and fore brain take on different tasks, as we've known for ages. I don't really have a problem calling them different organs.