(a) Permissible Joinder. The court may order 2 or more indictments or accusations tried together if the offenses and the defendants, if there are 2 or more, could have been joined in a single indictment or accusation. The procedure shall be the same as if the prosecution were under such single indictment or accusation.
(b) Mandatory Joinder. Except as provided by R. 3:15-2(b), a defendant shall not be subject to separate trials for multiple criminal offenses based on the same conduct or arising from the same episode, if such offenses are known to the appropriate prosecuting officer at the time of the commencement of the first trial and are within the jurisdiction and venue of a single court.
