These 2 documents are different, although there appear to be some overlap.
In LPA Form 1, for Personal Welfare powers, there is a question on whether your Donee’s authority shall extend to giving or refusing consent to the carrying out or continuation of treatment, including the conduct of a clinical trial, by a person providing health care for me. These decisions are made by the appointed Donee.
An Advance Medical Directive (AMD) is a legal document you sign in advance to inform your doctor that you do not want the use of any life-sustaining treatment to be used to prolong your life in the event you become terminally ill and unconscious and where death is imminent.
The AMD can be made by any person, aged 21 years and above, and is not mentally disordered. The AMD form is a legal document which must be completed and signed in the presence of two witnesses before it is returned to the Registrar of AMDs. The patient’s doctor must be one of the two witnesses, while the other witness must be at least 21 years old. In addition, both witnesses must not have any vested interests in the patient’s death.