If proceedings to open the succession of a deceased person who was not domiciled in this state at the time of his death are brought in two or more district courts of competent jurisdiction, the court in which the proceeding was first brought shall retain jurisdiction over the succession, and the other courts shall stay their proceedings.
The court retaining jurisdiction may adopt by ex parte order any of the proceedings taken in any other Louisiana court of competent jurisdiction, with the same force and effect as if these proceedings had been taken in the adopting court.