(b) The restrictions in subsection (a) hereof as to notice, hearing, and effective period shall not apply to such regulations or amendments as may be approved by the superintendent for calendar years as to which similar regulations or amendments have been adopted by the National Association of Insurance Commissioners.
(c) If the superintendent finds, after notice and hearing, that any such insurer has failed to comply with the requirements of this section, he may order such insurer to change its methods of reporting or to modify its basis of allocation so as to produce reasonable and equitable results.