CONFLICTING TKOF THRUST PARAMETERS BETWEEN LEFT AND RIGHT ENGINES OF A320 RESULTS IN REJECTED TKOF AND MAINT INSPECTION.

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PREFLT AND TAXI OUT WERE NORMAL. ALL CHKLIST/BRIEFINGS COMPLIED WITH. DURING ENG START; I ELECTED TO GO AHEAD AND START BOTH ENGS; SINCE MY EXPECTED TAXI TIME WAS LESS THAN 5 MINS. HOWEVER; AFTER WE STARTED OUR TAXI; WE RECEIVED AN EXPECTED DEP TIME FROM LAS GND OF APPROX 12 MINS. DURING TAXI OUT; ALL TKOF ITEMS WERE REVIEWED AND THE TAXI CHKLIST WAS COMPLETED. WHEN OUR DEP TIME ARRIVED; WE COMPLETED THE BELOW-THE-LINE PORTION OF THE CHKLIST AND WERE CLRED INTO POS AND HOLD ON RWY 19L. I ESTIMATE THAT WE WERE IN POS FOR ABOUT 2 MINS. WHEN WE RECEIVED TKOF CLRNC; I ACKNOWLEDGED THE CLRNC AND THE FO RELEASED THE BRAKES; AND BROUGHT THE THRUST LEVERS UP TO THE STABILIZED POS; AND THEN ADVANCED THEM TO THE BRIEFED FLEX POS; AND CALLED 'FLEX.' AS I ASSUMED CTL OF THE THRUST LEVERS; AND SCANNED THE ENG INSTS; I OBSERVED THAT THE ENGS WERE NOT INDICATING THE SAME THRUST LIMITS. ENG #2 PARAMETERS APPEARED TO BE AT FLEX PWR; BUT ENG #1 INDICATIONS AND THRUST APPEARED TO BE AT TOGA. I CHKED THE THRUST LEVERS IN THEIR PROPER TKOF DETENT; AND THEN AGAIN OBSERVED THE ENG INDICATIONS; WHICH HAD NOT CHANGED. ON ENG #1; THE TARGET THRUST SETTING (WHITE DOUGHNUT) WAS SITTING ON THE AMBER TICK MARK (FOR TOGA) WHILE ON ENG #2; THE DOUGHNUT WAS AT THE L OF THE AMBER MAX SETTING MARK. BOTH ENGS HAD SPOOLED UP TO THEIR TARGET THRUST SETTING MARKS. AS I WAS TRYING TO UNDERSTAND WHAT I WAS LOOKING AT; AND FIGURE OUT WHAT WAS WRONG; WE THEN RECEIVED AN ECAM CAUTION CHIME. THERE WAS NOT A LOT OF TIME TO TRY TO DIAGNOSE THE PROB; AND WHEN THE CAUTION CHIME SOUNDED; I ELECTED TO REJECT THE TKOF. I CALLED REJECTING AND ASSUMED CTL OF THE ACFT. I REDUCED THE THRUST LEVERS BACK TO IDLE; AND SINCE WE WERE STILL BELOW THE AUTOBRAKE ACTIVATION SPD (IE; A LOW SPD ABORT); I APPLIED MANUAL BRAKING AND ALLOWED THE ACFT TO GO DOWN TO THE NEXT INTXN. ACTUALLY; TWR REQUESTED US TO GO BY THE FIRST INTXN AND EXIT AT THE NEXT ONE. WE INFORMED THE PAX AND FLT ATTENDANTS THAT EVERYTHING WAS NORMAL; BUT THAT WE HAD SOME INCORRECT INST VALUES ON THE ENGS AND THAT WE WOULD BE RETURNING TO THE GATE TO HAVE EVERYTHING CHKED OUT. MAINT WAS CALLED; AND THEY RAN THROUGH THEIR CHKS; BUT FOUND NOTHING IN THE DATABASE. THEY RESET ALL THE FMGS COMPUTERS AND WE RE-BOARDED THE PAX; REFUELED THE ACFT AND PROCEEDED TO COMPLETE THE FLT UNEVENTFULLY.