Do I need to apply again for the CKA as part of PCC credentialing after I appeared for CKA during ACC credentialing?

Yes, you will have to write the CKA. The ICF Credentialing Exam must be taken with each new application for a Credential, even if the exam has already been passed. Each credential is a stand-alone achievement and the applicant must complete all requirements for the Credential for which they applied.