NMAC BTWN AN SMA ON FINAL AT 300 FT AND ANOTHER ACFT 10 FT LOWER ALSO ON FINAL WHICH HAD BEEN OVERTAKEN BY RPTR.

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I WAS ON AN IFR FLT CRG-MLG AT 6000 FT; ORL APCH CTL. AT APPROX 30 MI OUT; I ASKED FOR A LOWER ALT. THEN; ABOUT 20 MI OUT; I ASKED CTR IF IT WOULD BE EASIER FOR THEM IF I COULD CANCEL IFR. THE CTLR SAID RADAR SVC TERMINATED; FREQ CHANGE APPROVED. I CALLED DAYTONA APCH CTL. HE GAVE ME A XPONDER CODE AND SAID HE HAD NO RADAR CONTACT; THEN HE SAID HE HAD A TARGET 5 MI OUT; AND I TOLD HIM IT WAS ME. HE THEN TURNED ME OVER TO TWR. HE TOLD ME TO RPT A 2 MI L BASE OVER THE INTERSTATE (HE WAS VERY BUSY). WHEN I GOT A CHANCE TO TALK; I WAS TURNING FINAL AT 2 MI. HE THEN ASKED IF I WAS SURE I WAS LINED UP WITH RWY 9L. I SAID YES; ABOUT 1 MI FINAL. HE SAID I HAD OVERTAKEN ANOTHER AIRPLANE ON FINAL. I DID NOT SEE THE AIRPLANE. THE OTHER PLT SAID THAT I HAD PASSED OVER TOP OF THEM AT 10 FT. MY PAX TOLD ME LATER THAT HE SAW THE OTHER AIRPLANE ON THE LOWER R SIDE OF OUR AIRPLANE. MY XPONDER WAS WORKING FOR EVERYONE EXCEPT DAYTONA APCH AND MLB TWR. I THINK HE GAVE ME A WRONG CODE OR I PUT THE WRONG CODE IN MY XPONDER. PLUS A VERY CONGESTED 2 RWYS; SAME DIRECTION.