Note
A5.5(b): "Applicants for a further residence class visa under RV2 [Resident visa holders applying for a permanent resident visa] or RV4 [Grant of a second or subsequent resident visa] will not usually need to submit a police or similar certificate, unless specifically asked to by an immigration officer."
You will not normally need to worry about submitting updated police clearance certificates from your original country if you are the holder of a Resident Visa applying for a Permanent Resident Visa. It is far more likely that INZ will request a New Zealand police clearance certificate, but this is be done by INZ themselves on your behalf: you will not need to do anything in this regard.
If you do need to submit updated police clearance certificates from your original country, the immigration officer assessing your application will let you know. Take note though: A5.5 mentions "police or similar certificate", so a letter from company with endorsement and/or school letter will likely be considered unacceptable. From my experience with my original Resident Visa application, it must be an original police clearance certificate.
If I were in your position, I would not even bother with obtaining a police clearance certificate from my original country, unless and until INZ decides to ask for one.