Every person to whom administration is granted in respect of the estate of a person dying after the end of the year 1955 shall, subject to any limitations contained in the grant, have the same rights and liabilities and be accountable in the same manner as if he were the executor of the deceased; and, where the High Court grants administration with a will annexed, that will shall be performed and observed by the administrator in the same manner as if probate of it had been granted to him as executor.