I see, that to this point, you've elicited no answers. Probably because, other than some extremely specialized animal science types, the answer to your question would be difficult to determine.
I suspect, opinion only, that autism in humans is, at best, difficult to diagnose. In fact, there's a great debate as to whether autism , as a stand alone ailment, actually exists. I do know though, that the symptoms leading to such a diagnosis involve the higher functions of the brain in humans and would not be recognizable in lower species, even primates... again, opinion only.
Interesting and insightful question though...