APCH CTL CALLED OUT 1 B-757 TO AN APCHING ACFT FOR A VISUAL PARALLEL APCH. THERE WAS ANOTHER B-757 ON APCH THAT WAS MISTAKEN FOR THE TARGET ACFT.

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APCH CTLR ASKED IF WE HAD A 757 AT 1 O'CLOCK POS. BOTH THE COPLT AND I CONFIRMED A 757 AT OUR 1 O'CLOCK POS. I ADVISED THE CTLR WE HAD IT IN SIGHT AND HE SAID THAT WE WERE CLRED FOR A VISUAL APCH FOR RWY 24R THE 757 WAS FOR THE 24L RWY AND THAT WE SHOULD NOT PASS HIM. ON OUR BASE LEG THE CTLR KEPT ASKING IF WE HAD THE TFC AND WE KEPT SAYING YES UNTIL HE DSNDED INTO THE HAZE AT WHICH TIME I SAID WE NO LONGER COULD SEE HIM. WE WERE ON R BASE THE 757 WAS LINED UP WITH 24L AND HE WAS AT OUR 2:30 POS. THE CTLR WAS NOW INDICATING OUR TFC WAS AT OUR 11:30 POS AND HIGH AND IT WAS OBVIOUS AS WE WERE GOING TO TURN ON FINAL THAT WE WOULD BE AHEAD OF THIS ACFT. WE SAW A 757 IN OUR 1 O'CLOCK POS WHEN HE CLRED US FOR THE VISUAL BUT OBVIOUSLY IT WAS NOT THE 757 HE MEANT. THIS 757 WAS WELL BEHIND THE 757 WE SAW IN OUR 1 O'CLOCK POS. THE CTLR DID NOT COM TO US IN A TIMELY MANNER THAT HE WAS CONCERNED THAT WE WOULD BE AHEAD OF HIS TFC AND HIS CALL FOR 1 O'CLOCK TFC (HIS INTENDED) WAS NOT 1 O'CLOCK FOR US. HE COULD HAVE VERY EASILY SAID OUR TFC WAS THE SECOND 757. THEN WE WOULD HAVE BEEN ALERTED TO LOOK FOR ANOTHER 757. AS IT WAS WE SAW ONE AT OUR 1 O'CLOCK AND TOOK OUR INSTRUCTIONS OFF OF HIM.