previously, u could transfer a karachi number to lets say islamabad number, and a lahore number to karachi number.. that practice was called province transfer.. now whenever there is a province transfer, the number remains the same, while u can pay excise taxes locally,
AA; AC = Reregistered or Tax Exemption
used to happen often when one of the plates used to get misplaced, u were suppose to get a new number.. now u ll get only new plates with "duplicate" being mentioned, while number will remain the same..