Same issuer, different stages of the same career
The SSCP and CISSP are designed as complementary credentials at different career stages. The SSCP targets practitioners in the first few years of their security career; the CISSP targets practitioners who have accumulated five years of experience and are operating at the senior level.
ISC2 explicitly positions them as a progression. Many practitioners earn the SSCP at the one-to-three-year mark, then pursue the CISSP at the five-year mark. The SSCP signals competent hands-on security work; the CISSP signals senior-level capability across the discipline.