It's possible that that's accurate, but at the moment we don't know enough about autism to say that with confidence.
At the moment, we don't really know what those neurological conditions are, and how they relate, or differ from one another.
To permit myself an analogy, we're seeing the leaves rustling, but we don't know what's moving them. The wind? Birds? An earthquake?
It's only recently that research is starting to turn to identifying sub types of autism, rather than trying to find a single underlying biological explanation like "the autism gene".