TRAFFIC SEQUENCE MIXUP BETWEEN ACFT ON VISUAL APCH TO RWY 23.

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ON APCH TO RWY 23 AT CLT WE WERE TURNED TO A HDG FOR OUR BASE LEG. TFC MLG Y WAS CALLED AT 2 O'CLOCK. WE CALLED TFC INSIGHT AND THEN WERE CLRED FOR A VISUAL TO FOLLOW HIM. IN MY TURN TO FINAL I SPOTTED A SECOND MLG Z HIGH AT MY 10 O'CLOCK POS. I FIRST THOUGHT HE WAS BEING VECTORED OVER THE ARPT FOR ANOTHER RWY. ON ABOUT A 6 MI FINAL THE MLG Z CAME OVER US AND STARTED TO DESCENDED FOR AN APCH TO 23. I STARTED A TURN TO THE LEFT. THE FINAL CTLR AT FIRST TOLD ME TO TURN RIGHT. I FELT THIS WOULD PUT US IN CONFLICT. HE (THE CTLR) OBVIOUSLY AGREED AS HE INSTANTLY CAME BACK WITH 'LEFT TURN APCH.' HE THEN STATED SOMETHING TO THE EFFECT; 'EVERYBODY STANDBY WHILE I STRAIGHTEN OUT THE APCH SEQUENCE.' I NEVER FELT WE WERE IN DANGER OR WOULD HAVE TO TAKE ABRUPT ACTION. I THINK THE CONFUSION COMES FROM MINIMUM SEP FROM TOO MANY AIRPLANES ON A VFR DAY FROM 1 CTLR. SUPPLEMENTAL INFO FROM ACN 82110: WE REQUESTED A LEFT TURN BACK TO A LEFT BASE. THIS TURN WAS AGREED TO BY THE CTLR. FROM THIS POS WE MADE THE VISUAL APCH TO LNDG. SUPPLEMENTAL INFO FROM ACN 82115:WE HAD NOT SEEN HIM BEFORE. THE MLG Z THEN CROSSED THE FINAL APCH COURSE IN FRONT OF US AT AN ANGLE OF 90 DEGS TO THE INBND COURSE. THIS ACFT WAS MANEUVERING FOR THE VISUAL TO FOLLOW THE ACFT THAT WE WERE CLRED TO FOLLOW. IT APPEARED THAT THERE WAS SOME CONFUSION BTWN THE CTLR AND THE ACFT ON APCH AS TO THE SEQUENCE FOR LNDG.