Okla. Stat. tit. 58, § 58-484: Assignment of contract

Upon the confirmation of the sale, the executor or administrator

must execute to the purchaser an assignment of the contract, which

vests in the purchaser, his heirs and assigns, all the right, title

and interest of the estate, or of the persons entitled to the

interest of the decedent in the lands sold at the time of the sale

and the purchaser has the same rights and remedies against the

vendor of such land as the decedent would have had if he were

living.