N.Y. Gen. Mun. Law § 767
Except as otherwise provided by law and except for those officials and employees protected by tenure of office, civil service provisions or collective bargaining agreement, upon the effective date of consolidation, all appointive offices and positions then existing in all component local government entities involved in the consolidation shall be subject to the terms of the joint consolidation agreement or elector initiated consolidation plan, as the case may be. Such agreement or plan may provide for instances in which there is duplication of positions and for other matters such as varying length of employee contracts, different civil service regulations in the constituent entities and differing ranks and position classifications for similar positions.
N.Y. Gen. Mun. Law § 767