I have written following code to insert records on junction object.

    public static List<PDCN__c> addSelectedPDCNs(List<String> selectedRecords, String groupId) {
            system.debug('Entering addSelectedPDCNs');
            system.debug('Selected Records are-->'+selectedRecords);
            system.debug('Group Id is-->'+groupId);
            
            List < PDCN__c > lstAddId = [SELECT Id from PDCN__c where Name IN: selectedRecords];
            system.debug('Record Ids Are-->'+lstAddId);
            
            List<PDCNGrpJunc__c> lstJunc = new List<PDCNGrpJunc__c>();
            
            for( PDCN__c  pdcn : lstAddId ) {
                system.debug('Inside For Loop-->'+pdcn);
                PDCNGrpJunc__c juncRec = new PDCNGrpJunc__c();
                juncRec.PDCN__c = pdcn;
                juncRec.PDCN_Group__c = groupId;
                lstJunc.add(juncRec);
            }
            //insert lstJunc;
            try{
                system.debug('Trying Insert');
                system.debug('');
                insert lstJunc;
                    }
             catch(Exception e)
            {
                System.debug('Exception Occured='+e.getMessage());
            }
            
            return lstAddId;
        }

I am getting error in juncRec.PDCN__c = pdcn; line as :-

> Illegal assignment from PDCN__c to Id

I am not sure what supposed to be problem or solution..
Thanks in Advance!!