A FLC; ARRIVING ZZZ USED THE WRONG CODE WORD; WERE DIVERTED TO ZZZ1.

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UPON RPTING TO WORK FOR MY TRIP I INTRODUCED MYSELF TO THE CAPT AND INFORMED HIM THAT THIS WOULD BE MY FIRST FLT INTO ZZZ SINCE BEFORE 9/TUE/01. I TOLD HIM THAT I HAD REVIEWED THE NEW PROCS FOR FLT INTO ZZZ; INCLUDING THE NEED FOR THE CAPT TO CALL DISPATCH PRIOR TO EACH FLT; THE USE OF THE CODE WORD WITH ZZZ APCH CONTROL; AND THE AMENDMENTS TO ARRIVAL AND DEP PATHS AT ZZZ. THE CAPT ASSURED ME THAT HE HAD BEEN FLYING THE SAME TRIP FOR THE PREVIOUS 2 WKS AND THAT HIS FLTS HAD BEEN UNEVENTFUL AS THE NEW PROCS WERE STRAIGHT FORWARD IN PRACTICE. WHILE ENRTE TO ZZZ I ASKED THE CAPT FOR THE CODE WORD FOR ZZZ; AND HE INFORMED ME THAT HE HAD NOT OBTAINED IF PRIOR TO DEP. AS WE DID NOT POSSES THE CODE WORD; UPON CHKING IN WITH ZZZ WE WERE GIVEN VECTORS TO ZZZ1; WHERE WE DIVERTED WITHOUT INCIDENT. SUPPLEMENTAL INFO FROM ACN 531085: USED WRONG CODEWORD ON INITIAL APPROVAL CALL AT ZZZ BY MISTAKE RESULTING IN MANDATORY DIVERSION TO ZZZ1. I WAS TOLD CODEWORD BY DISPATCH AND WROTE IT DOWN CORRECTLY; BUT MISTAKENLY TOLD FO THE WORD I USED ON THE LAST FLT TO ZZZ. THEY ARE VERY CLOSE. I THINK BOTH PLTS SHOULD BE TOLD SEPARATELY. ALSO IF THERE WAS A LOSS OF COMMUNICATION AFTER USING THE WRONG CODEWORD; THERE COULD BE A BIG PROB.