Iowa Code § 490.904

A transaction effected under this subchapter shall not create or impair a right, duty, or obligation of a person under the statutory law of this state other than this subchapter relating to a change in control, business combination, control-share acquisition, or similar transaction involving a domesticating or converting domestic corporation, unless the approval of the plan of domestication or conversion is by a vote of the shareholders or the board of directors which would be sufficient to create or impair the right, duty, or obligation directly under that law.