Mo. Rev. Stat. § 301.279

The commission shall cooperate with the public service commission in the matter of negotiating and entering into reciprocal agreements as provided for under sections 301.271 to 301.279 and as provided for by section 386.220, but the provisions and agreements as to reciprocity concerning motor vehicle registration shall be separate and distinct from and not governed by any provisions or agreements as to reciprocity concerning public service commission fees and charges.