You may find this link helpful in answering your question.
in short , it does appear that RHEL is a part of RHOCP offering.
Hi @SandeshKS1 ,
Thanks for reaching out!
In the Self-managed OpenShift software offerings , you have RHEL subscription :
Refer this diagram for complimentary products included in OCP subscription :
Refer here for more details and if you would like to talk to a Red Hat expert on the same : https://www.redhat.com/en/technologies/cloud-computing/openshift/container-platform