AN ATX D208 PLT FOLLOWS THE WRONG TFC TO RWY 27L DURING THIS TURN TOWARDS THE ASSIGNED HDG FOR ILS RWY 26R AT ATL; GA.

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I WAS APCHING ATL FROM THE WNW ON AN IFR FLT PLAN RECEIVING VECTORS FOR RWY 26R. I WAS HDG APPROX 90 DEGS WHEN THE CTLR POINTED OUT A DC9 AT MY 3 O'CLOCK POS WHICH WOULD BE MY TFC TO FOLLOW. THE CTLR THEN ISSUED A VECTOR OF 180 DEGS AND 240 DEGS FOR THE FINAL APCH TO RWY 26R. AFTER TURNING TO A HDG OF APPROX 200 DEGS; I OBSERVED A DC9 AT MY 11 O'CLOCK POS THAT I THOUGHT COULD BE ON FINAL APCH TO RWY 26R. I DISCONTINUED MY TURN TO KEEP THE TFC IN SIGHT. MY IMMEDIATE CONCERNS WERE: 1) I/CTLR HAD MISIDENTED THE TFC I WAS TO FOLLOW. 2) THE CTLR HAD MADE A MISTAKE ABOUT FOLLOWING TFC. DUE TO MY CLOSE PROX TO THE RWY 26R FINAL APCH COURSE; I FLEW THROUGH THE COURSE HDG SSW. THE CTLR ISSUED AN IMMEDIATE VECTOR TO 330 DEGS TO REJOIN THE RWY 26R FINAL APCH COURSE. AT THIS TIME I REALIZED THE DC9 WAS ON FINAL APCH TO RWY 27L (APPROX 1 MI TO THE S). DUE TO THE CLOSE PROX OF THE APCH COURSES OF RWY 26R AND RWY 27L IN CONJUNCTION WITH THE EARLY MORNING HAZE; I BELIEVE THIS SIT COULD HAVE BEEN AVOIDED BY THE CTLR ISSUING A TA FOR TFC ON THE PARALLEL FINAL APCH COURSE. I THINK THIS WOULD BE ESPECIALLY IMPORTANT GIVEN THAT THE TFC I WAS FOLLOWING AND THE TFC ON THE PARALLEL COURSE WERE IDENTICAL. THIS SIT WOULD HAVE BEEN AVOIDED; HAD I IGNORED THE TFC WHICH I BELIEVED WAS A CONFLICT; TURNED TO THE INBOUND COURSE AND IMMEDIATELY QUESTIONED THE CTLR. THIS WAS PROBABLY THE BEST SOLUTION BUT I DON'T RECALL IF I HAD AN OPPORTUNITY GIVEN THE RADIO TFC AT THE TIME. I KNOW MY INSTINCTS WERE TO KEEP THE CONFLICTING TFC IN VIEW.