The milk sanitation board may promulgate regulations setting forth definitions and standards of identity for milk and milk products. When promulgating such regulations the board shall not be inconsistent with those standards of identity for milk and milk products established by existing laws or those promulgated under the federal act (RSA 146:2, X). Said regulations shall be promulgated in the manner prescribed by paragraph II of N.H. Rev. Stat. § 184:93.