(a) Subject to section 4156 of this title, a plan of merger shall be approved in accordance with the organizational documents of the constituent limited liability company, or, in the absence of a provision governing approval of a merger, by all the members of the limited liability company entitled to vote on or consent to any matter.
(b) Subject to section 4156 of this title and any contractual rights, after a merger is approved, and at any time before the articles of merger are delivered to the Secretary of State for filing under section 4150 of this title, a constituent limited liability company may amend the plan or abandon the merger:
(1) as provided in the plan; or
(2) except as otherwise prohibited in the plan, with the same consent as was required to approve the plan.