Any local board may adopt an alternative form and means for obtaining and retaining duplicative voter registration information which is approved by the state board of elections. The form shall provide for the information required by § 17-9.1-6 and shall be kept in the order specified by § 17-9.1-13 and § 17-9.1-14. The alternative form need not be of a distinctive color; provided, that the alternative form is substantially different in size and shape from the card designated the original under the provisions of § 17-9.1-6. The alternative form also need not provide for a signature.