PAM SC is essentially the ENTM with SAM/PUPM (the privileged account stuff) removed.
The REST api is for the SAM/PUPM side of things so it does not exist in PAM SC.
The documentation for the REST api in PIM 14 is here:
https://techdocs.broadcom.com/us/en/symantec-security-software/identity-security/privileged-identity-manager/14-0/integrating/rest-based-api.html
This does not exist in the PAM SC documentation:
https://techdocs.broadcom.com/us/en/symantec-security-software/identity-security/privileged-access-manager-server-control/14-0.html