RPTR ERROR ADMITTED IN WRONG RWY APCH LNDG. FOREIGN AIRSPACE.

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THIS RPT IS ONE OF POOR MENTAL WORK BY A MAJOR AIRLINE CREW IN A STATE-OF-THE-ART TURBOJET. IN CRM WE CALL THIS 'THEORY OF THE SIT VERSUS REALITY.' BASED ON WX FORECAST AND CAPT FAMILIARITY WITH ARPT; WE BRIEFED ENRTE FOR A VOR-DME APCH TO RWY 13; MOST LIKELY A VISUAL DUE TO CLR SKIES. (IAH-BJX-MMLO; LEON; MEXICO) SCHEDULED ACR. 15 MI OUT APCH CTL ADVISES IT WILL BE A VOR-DME APCH TO RWY 31 INSTEAD. WE SET INSTS FOR RWY 31. WE CAME OVER THE MOUNTAIN AND WERE SUPPOSED TO ENTER L DOWNWIND FOR RWY 31; NO RPTED TFC IN AREA. WE WERE CLRED VISUAL APCH AND CLRED TO LAND RWY 31. INSTEAD WE CAME OVER MOUNTAIN AND INTERCEPTED FINAL FOR RWY 13 AND LANDED. WHILE TAXIING TO TERMINAL; TWR ADVISED US WE HAD LANDED ON RWY 13; OTHERWISE WE WOULD NEVER HAVE REALIZED THIS ERROR! CONTRIBUTING FACTORS: 1) INITIAL BRIEF FOR RWY 13; MIND SET FOR RWY 13. 2) COMPLACENT MENTAL WORK DUE TO CLR SKIES AND NO TFC. 3) EFIS IS WONDERFUL EQUIP -- BUT ALWAYS ONE PLT MUST BE USING RAW DATA; AND SHOULD BE IN VOR/ILS MODE (THIS IS POLICY). 4) FOR ME; FIRST LEG WITH CAPT I HAVE NEVER MET WHO APPEARS TO HAVE BEEN A SINGLE SEAT FIGHTER PLT AS HE IS DOING HIS AND MY JOB AND NOT READING CHKLIST WHEN I ASK FOR IT. THIS IS NONSTANDARD AND DISCONCERTING TO ME. 5) WE WERE IN A HURRY AS WE WERE 50 MINS LATE DUE TO DELAY DEPARTING IAH. I BELIEVE CAPT FELT RESPONSIBLE FOR DELAY AND WAS TRYING TO GET BACK ON SCHEDULE. I TOLD HIM LATER AS WE CONTINUED TO HURRY AND RUSH THAT I DID NOT CARE ABOUT ON-TIME-BONUS CHK; THAT I PREFERRED TO NOT RUSH.