I am not an attorney, but I can tell you that I recorded certified copies of the will, letters testamentary, and order by the judge appointing me as the Executor of a testator living in Texas. Will was probated in Travis County, and only in Illinois did I have to "probate" the will again (which the operator let me do with an affidavit of heirship). I am assuming your testators were residents of Texas, not Oklahoma, in which case, if you know the location of the property, I would use a simple conveyance form from the Executor of the Estate to the heir, and file that, a copy of certified will, etc in the County in Oklahoma. I do not believe you have to reprobate this in Oklahoma to do what you want to do.