Tex. Civ. Prac. & Rem. Code § 71.022

If the executor or administrator of the estate of a nonresident individual is the plaintiff in an action under this subchapter, the foreign personal representative of the estate who has complied with the requirements of Chapter 503, Estates Code, for the probate of a foreign will is not required to apply for ancillary letters testamentary under Section 501.006, Estates Code, to bring and prosecute the action.