Vendor-neutral seniority vs. vendor-neutral skills ladder
Both are vendor-neutral, but from different issuers with different missions. The CISSP comes from ISC2 and certifies senior, experience-based security judgment. PenTest+ comes from CompTIA, whose certifications form a skills ladder (Network+, Security+, CySA+, PenTest+, SecurityX) validating specific capabilities.
The CISSP says you can lead security; PenTest+ says you can perform a penetration test.