N.J. Stat. Ann. § 34:11B-14

No provision of this act shall be deemed to justify an employer in reducing employment benefits provided by the employer or required by a collective bargaining agreement which are in excess of those required by this act. Nor shall any provision of this act, or any regulations promulgated to implement or enforce this act, be construed to prohibit the negotiation and provision through collective bargaining agreements of leave policies or benefit programs which provide benefits in excess of those required by this act. This provision shall apply irrespective of the date that a collective bargaining agreement takes effect.