Lol... don't lie man. AUS PR or NZ PR thibba kiyala anith rate work karanna be, PR means you still have Sri Lankan passport.
Other thing is you don't have to wait 2 yrs to get Resident visa, if you have NZ working Visa, You can apply for resident visa anytime as long as you satisfy other conditions.
If you are a NZ citizen, then you can work in AUS. Like that, you need to have Aus citizenship to work in NZ.