Opposite ends of the security career
The CC is designed for complete newcomers to cybersecurity — students, career-changers, IT professionals exploring a move into security, and anyone with no prior security experience. It has no prerequisites of any kind.
The CISSP is designed for experienced practitioners with five years of paid security work experience. It is not appropriate for newcomers, and ISC2 enforces this through both the experience requirement and the difficulty of the exam.