The main difference between a Property Manager and a Property Administrator under the Protection of Personal and Property Rights Act (PPPR Act) is the value of the subject person's property and income: 

Property administrator

Appointed when the subject person's property is less than $25,000 and their income or benefit is less than $40,000 per year. They do not have to report to the Court so many people prefer to take on this role.

Property manager

Appointed when the subject person's property or income is worth more than the amounts above, unless the subject person is in residential care and money is going directly to the residential provider.