Shingles is less contagious than chickenpox. While shingles cannot be passed from person-to-person, the varicella zoster virus can — via direct contact with fluid from an active shingles rash to a person who has never had chickenpox. When that happens, the person exposed to the virus might develop chickenpox, but not shingles.

https://www.riteaid.com/pharmacy/services/vaccine-central/immunization-information/shingles