Except for a petition for the appointment of a conservator under paragraph (1) or paragraph (2) of subdivision (a) of Section 1994, if a petition for the appointment of a conservator is filed in this state and in another state and neither petition has been dismissed or withdrawn, the following rules apply:
(a) If the court in this state has jurisdiction under Section 1993, it may proceed with the case unless a court in another state acquires jurisdiction under provisions similar to Section 1993 before the appointment.
(b) If the court in this state does not have jurisdiction under Section 1993, whether at the time the petition is filed or at any time before the appointment, the court shall stay the proceeding and communicate with the court in the other state. If the court in the other state has jurisdiction, the court in this state shall dismiss the petition unless the court in the other state determines that the court in this state is a more appropriate forum.