translate English to French: If, on the other hand, the comparison reveals that the knowledge and qualifications certified by the foreign diploma and those required by the national provisions correspond only partially, the competent authorities are entitled to require the person concerned to show that he has acquired the knowledge and qualifications which are lacking (judgment in Vlassopoulou, cited above, paragraph 19).
Si, en revanche, la comparaison ne révèle qu'une correspondance partielle entre ces connaissances et qualifications, les autorités compétentes sont en droit d'exiger que l'intéressé démontre qu'il a acquis les connaissances et qualifications manquantes (arrêt Vlassopoulou, précité, point 19).