Proceedings for a change of organization may be:
(a) Undertaken subsequent to or concurrently with proceedings for the formation of an assessment district under this chapter. Any or all such proceedings may be conditioned on the completion of any other or all such proceedings.
(b) Combined with proceedings for the formation of an assessment district under this chapter. In such case, any of the several resolutions, reports, notices, or other instruments provided for in this part may be combined into single documents.