A written will does not need to meet the requirements of Section 251.051 if the will is executed in compliance with:
(1) the law of the state or foreign country where the will was executed, as that law existed at the time of the will's execution; or
(2) the law of the state or foreign country where the testator was domiciled or had a place of residence, as that law existed at the time of the will's execution or at the time of the testator's death.