Explanation:
Enrolled nurses practise under the direction and delegation of a registered nurse or nurse practitioner to deliver nursing care and health education across the life span to health consumers in community, residential or hospital settings.

Enrolled nurses contribute to nursing assessments, care planning, implementation and evaluation of care for health consumers and/or families/whanau.The registered nurse maintains overall responsibility for the plan of care.
http://www.nursingcouncil.org.nz/Nurses/Scopes-of-practice/E...

2. Esta norma aplica-se à recorrente atendendo que, além de possuir o título de Enrolled Nurse, exerce a sua actividade profissional de enfermeira de cuidados gerais, em Portugal desde 28-4-1965, fazendo parte do quadro de pessoal de um estabelecimento de saúde português Hospital Britânico.
http://www.dgsi.pt/jtca.nsf/170589492546a7fb802575c3004c6d7d...

A registered nurse (RN) is a nurse who has graduated from a nursing program and met the requirements outlined by a country, state, province or similar licensing body in order to obtain a nursing license.[1] An RN's scope of practice is determined by local legislation governing nurses, and usually regulated by a professional body or council.
https://en.wikipedia.org/wiki/Registered_nurse

enfermeiro graduado registered nurse
https://www.infopedia.pt/dicionarios/portugues-ingles/enferm...

Nota: Manteria as duas classificações em inglês e traduziria entre parênteses em português, uma vez que não há uma correspondência muito direta.