Tex. Occ. Code § 301.259

On payment of a fee established by the board, the board may issue a license to practice as a registered nurse or vocational nurse in this state by endorsement without examination to an applicant who holds a registration certificate as a registered nurse or vocational nurse, as applicable, issued by a territory or possession of the United States or a foreign country if the board determines that the issuing agency of the territory or possession of the United States or foreign country required in its examination the same general degree of fitness required by this state.