What you call CS and AS overlap so much in the foundational stuff that the portions that are different can be in-major elective options and out-of-major elective recommendations within the same major. It is not like where the divergence is fairly large, like with electrical and mechanical engineering. Perhaps a better analogy may be mechanical and aerospace engineering, where the latter is often treated as an elective specialty within the former. Or computer engineering, which may be treated as an elective specialty in either computer science or electrical engineering.