Hello Student

No there is no similarity between the courses of BCA and CS. What are the courses there opposite to each other. For BCA Bachelor of Computer applications duty is to do programming and solve problem relating  programming, make some software programming Either. But  CS's  duty is of all of the companies for minuting,monitoring the duties of the Managers, meeting, amalgamation of the companies and the profit making theory implementation policy making. There is no duty of computing any financial model related to company affairs by the company secretaries. So both are the courses definitely different from each other.

Click on the link below to know more about BCA

https://www.careers360.com/courses/bca-bachelor-of-computer-applications

Click on the link below to know more about CS

https://www.careers360.com/courses/company-secretary-course

Hope this helps