A MOONEY 201 ON VISUAL APCH TO SNA TURNED IN TOO SOON AND EXPERIENCED A NEAR MISS WITH A HAWKER.

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ARPT WAS UNUSUALLY BUSY WITH MULTIPLE ACFT LNDG ON BOTH PARALLEL RWYS. I WAS INSTRUCTED TO HOLD W OF ARPT FOR ABOUT 10 MINS THEN TOLD TO ENTER DOWNWIND. AFTER ENTERING DOWNWIND; TWR SAID TO MAKE A 360 DEG L TURN PRIOR TO RE-ENTERING DOWNWIND FOR R TFC FOR RWY 19R. I WAS THEN TOLD TO FOLLOW A FALCON ON 4 MI FINAL FOR RWY 19R. AS I LOOKED FOR TFC; I SAW AN ACFT I THOUGHT WAS FALCON SO CALLED TWR WITH; 'FALCON IN SIGHT.' WHEN THAT ACFT PASSED BEYOND MY 3 O'CLOCK POS; I BEGAN A TURN R TO BASE LEG. AS I MADE THE TURN; I LOOKED TOWARD RWY 19R FOR FALCON. WHEN I DIDN'T SEE IT; I TURNED FURTHER R TO AVOID LNDG PATH. AT ABOUT THIS TIME; TWR CALLED AND ASKED IF I TURNED INSIDE FALCON. I REPLIED THAT I DID AND FALCON CALLED TO SAY THEY HAD ME IN SIGHT AND WERE PASSING BELOW ME. I ENDED UP LNDG BEHIND FALCON AFTER RESUMING MY APCH. THERE WAS NO MENTION OF ANY INCIDENT BUT IT WAS THE CLOSEST I HAVE EVER COME TO ANOTHER ACFT WHILE LNDG. I NOW REALIZE THE ACFT I THOUGHT WAS 'MY TFC' (FALCON) WAS ANOTHER ACFT ON FINAL FOR RWY 19L. IN FUTURE; IN SIMILAR SITUATION; I WILL ASK TWR TO CALL MY BASE TURN.