N.M. Stat. § 45-3-410
Formal testacy proceedings; probate of more than one
instrument.
If two or more instruments are offered for probate before a final order is entered in a
formal testacy proceeding, more than one instrument may be probated if neither
expressly revokes the other or contains provisions which work a total revocation by
implication. If more than one instrument is probated, the order shall indicate what
provisions control in respect to the nomination of a personal representative, if any. The
order may, but need not, indicate how any provisions of a particular instrument are
affected by the other instrument. After a final order in a testacy proceeding has been
entered, no petition for probate of any other instrument of the decedent may be
entertained, except incident to a petition to vacate or modify a previous probate order
and subject to the time limits of Section 3-412 [45-3-412 NMSA 1978].