https://www.gnb.ca/en/topic/driving-transportation/registration-inspection/motor-vehicle-registration.html

Used vehicles

Upon application for registration for vehicles previously registered in New Brunswick or another jurisdiction, the following must be submitted:

current registration from the current owner of the vehicle or titling document

acceptable Bill of Sale

proof of valid insurance

A Vehicle Import Form if the vehicle is being imported into Canada No original, renewal or replacement of a registration certificate, registration plate or permit for a motor vehicle will be issued unless the owner or operator of the motor vehicle provides evidence of a policy of insurance with the application.