(a) This article shall apply to any interest created after its effective date which complies with the requirements of this article, whether designated as a conservation easement or as a covenant, equitable servitude, restriction, easement or otherwise.
(b) This article shall apply to any interest created before its effective date if it would have been enforceable had it been created after the effective date of this article unless retroactive application contravenes the constitution or laws of this state or the United States.
(c) This article does not invalidate any interest whether designated as a conservation or preservation easement, a covenant, equitable servitude, restriction, easement or other designation that is enforceable under any other law of this state.