CALL SIGN CONFUSION WHEN BE02 FLC RECEIVE PDC FOR PREVIOUS FLT AND ATTEMPT TO TAXI WITH OLD FLT NUMBER WHILE RECEIVING A REVISED CLRNC UNDER THE NEW FLT NUMBER.

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I GOT MY PAPERWORK FOR FLT AC AND THE PDC WAS FOR FLT AB. THE PDC WAS GIVEN TO ME IN ERROR. IT WAS FOR THE LAST FLT TO THE SAME DEST. BECAUSE OF THIS PROB WITH THE PDC I GOT TAXI INSTRUCTIONS UNDER FLT AB WHEN I WAS REALLY FLT AC. WHEN IN THE TAXI PHASE; GND TOLD ME OF THE WRONG FLT NUMBER AND TOLD ME TO GO TO CLRNC DELIVERY FOR MY DEP CLRNC. GND DID NOT TELL ME TO STOP THE TAXI SO I CONTINUED TO TAXI WHILE MY FO WENT TO CLRNC DELIVERY ON THE OTHER RADIO TO GET THE NEW CLRNC. AS I CAME UPON A TXWY PERPENDICULAR TO THE ONE I WAS ON ANOTHER ACFT WAS COMING. I STOPPED BECAUSE THAT ACFT DID NOT APPEAR TO BE STOPPING; BUT IT DID. GND CTL TOLD ME TO TAXI TO RWY 5L SHORT OF RWY 5R ON TXWY N SO I FOLLOWED THOSE INSTRUCTIONS UNDER FLT NUMBER AB. WHEN I CAME UPON THE OTHER ACFT ON THE OTHER TXWY; WE BOTH STOPPED BECAUSE WE DID NOT KNOW WHICH ACFT HAD THE RIGHT-OF-WAY TO RWY 5R SHORT OF RWY 5L ON TXWY N. WE HAD BOTH BEEN CLRED TO TAXI TO THE RWY. GND CTL TOLD ME THAT I DID NOT RECEIVE TAXI CLRNC UNDER FLT NUMBER AC WHEN IN REALITY I RECEIVED TAXI CLRNC UNDER FLT AB. GND DID NOT TELL ME TO STOP WHEN HE FOUND OUT THAT MY FLT NUMBER WAS NOT AB BUT AC. TO HELP PREVENT THIS PROB IN THE FUTURE; CLE CLRNC DELIVERY SHOULD REQUIRE PLTS ON IFR FLTS TO VERIFY FLT NUMBER AND VERIFY XPONDER CODE. PLTS SUCH AS MYSELF WHO DO UP TO 9 LEGS PER DAY MUST CHK THAT THE PDC AND FLT ADVISORY MESSAGE MATCH.