JPQL RIGHT JOIN Issue

I'm trying to select the same fields between two tables using RIGHT JOIN... I got the error message 'Path expected for join! [select P.cin,P2.cin from com.kachafa.domain.Participant as P RIGHT JOIN ParticipantTwo as P2 ON P.cin =: P2.cin]'

name 1st data table : Participant // name 2nd data table : ParticipantTwo code as below :

public List<Participant> compareListParticipant(){
    List<Participant> result = null;
    
    try {
        String jpql = "select P.cin,P2.cin from Participant as P RIGHT JOIN ParticipantTwo as P2 ON P.cin =: P2.cin" ;
        Query query = entityManager.createQuery(jpql);
        result = query.getResultList();
        
    } catch (Exception e) {
        e.printStackTrace();
    }
    return result;
}

I didnt reach to solve the problem with the JPQL join, however I i did the below method with two lists, it works for me :

 private  List<String> getDifference(List<String> listA, List<String> listB) {
        Set<String> set = new HashSet<>(listA);
        List<String> result = new ArrayList<>();

        for (String element : listB) {
          if (!set.contains(element)) {
            result.add(element);
          }
        }

        return result;
      }