Computer Science often has a different curriculum depending on whether the CS program at the university grew out of its Math or Engineering department. I think this helps explain some of the wide variations in what is considered a "CS" degree.

We may be talking past each other - I am not talking about curriculum's, but the terms that those who do computer science research use to describe themselves. eximius made a claim I have seen no support for. All systems researchers that I know, including myself, consider ourselves computer scientists.