Paypal is country specific so if you move countries you have to open another paypal account in the country you reside in and add an address / phone number / bank accounts / cards from within that country.
However yes you can keep your old Aussie account open BUT you will have to make one of the accounts a business account.
Because you are only allowed 2 paypal accounts if 1 is personal and the other one is business.
If you have 2 of the same type you risk them all being limited.
Advice is voluntary. Kudos / Solution appreciated.