AN AIRBUS 321 WAS DISPATCHED IN NON COMPLIANCE WITH THE INCORRECT #2 AUTOPLT FLT GUIDANCE COMPUTER INSTALLED.

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FIRST LET ME BEGIN WITH SOME BACKGROUND INFO. I AM A LEAD AVIONICS TECHNICIAN WORKING LINE MAINT FOR ACR X AT ZZZ INTL ARPT. PART OF MY DUTIES IS TO REVIEW ALL INBOUND FLTS FOR MEL ITEMS FOR REPAIR. ON THIS MORNING; MY REVIEW SHOWED ACFT X AND Y (BOTH ACFT ARE A321'S) INBOUND TO ZZZ WITH AN FMGC ON MEL. I REVIEWED THE HISTORY FOR BOTH ACFT AND FOUND THAT BOTH WERE PROGRAMMED FOR REPLACEMENT OF AN XXXXXX (COMPANY PART NUMBER) BY MOC (MAINT CTL). I CONFIRMED THE AFFECTIVITY OF ACFT Y AND FOUND THAT THIS ACFT DID REQUIRE THE XXXXXX COMPUTER. SINCE BOTH ACFT WERE A321'S; I ASSUMED X ALSO USED AN XXXXXX. UNFORTUNATELY X REQUIRES AN XXXXXY COMPUTER (SAME COMPUTER WITH A DIFFERENT CAM SOFTWARE). ONCE AT THE ACFT AND AFTER THE ATTEMPTED RESET OF THE #2 FGC FAILED TO BRING THE COMPUTER BACK ON LINE; I INSTALLED A NEW COMPUTER. I USED AN XXXXXX COMPUTER BY MISTAKE. I ACCOMPLISHED THE TASK IN ACCORDANCE WITH MAINT MANUAL PROCS 22-83-34-000-001 (REMOVAL) AND 22-83-34-400-001 (INSTALL). ALL BITE CHKS AND A NAV DATA LOAD WERE ACCOMPLISHED WITH NO FAULTS DETECTED. THE MEL WAS REMOVED AND THE ACFT WAS CERTIFIED CAT II/III/IIIB STATUS. NO ECAM OR MAINT STATUS MESSAGES WERE DISPLAYED AND THE ACFT WAS RELEASED FOR SVC. WHEN I RETURNED TO THE OFFICE I STARTED TO ENTER THE ITEM INTO THE COMPUTER USING DDE (DIRECT DATA ENTRY). THE SYS FLAGGED THE INSTALLATION OF THE COMPUTER AS NOT IN CONFIGN FOR THIS ACFT. I CONFIRMED THAT I HAD INDEED INSTALLED AN INCORRECT COMPUTER. AS THE ACFT HAD ALREADY DEPARTED ZZZ; I IMMEDIATELY ADVISED MOC AND MY SUPVR OF THE PROB. MOC MEL'ED THE COMPUTER AT THE NEXT STATION; ZZZ1; AND HAD THE COMPUTER REPLACED 1 LEG LATER AT THE FIRST MAINT STATION (ZZZ1). THE ACFT FLEW NORMALLY AND GENERATED NO ECAM OR MAINT STATUS MESSAGES -- THE PFR (POSTFLT RPT) IN ZZZ1 WAS CLEAN.