ON THE LAS SKBER 2 ARR FOR RWY 25L; L30 APCH ISSUED A B737 AN INCORRECT HDG FOR THE RWY 25L FINAL INTERCEPT.

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ARRIVING LAS VIA THE SKEEBR2 ARR. WAS TOLD TO DSND TO 9000 FT. ABEAM THE FIELD IN VFR CONDITIONS; WAS TOLD TO DSND TO 8000 FT AND REDUCE SPD TO 220 KTS. WE WERE THEN TOLD TO EXPECT BASE TURN OVER THE ANTENNA FARMS; AND WE WERE #1 IN FRONT OF COMPANY ON LINDSEY ARR; RWY 25L. APPROX 30 SECONDS LATER; WE WERE GIVEN DSCNT TO 5000 FT AND A FREQ CHANGE. APPROX 15 SECONDS LATER; WE WERE GIVEN A 30 DEG HDG. WE ACKNOWLEDGED ALL CALLS. AS WE APCHED THE FINAL APCH COURSE; STILL ON A 30 DEG HDG; A COMPANY ACFT CAME UP ON FREQ 131.87 AND INDICATED APCH WANTED US ON 135.0. I RESPONDED ON COMPANY THAT WE WERE TALKING TO APCH ON 125.6. SIMULTANEOUSLY; ON 125.6 APCH CTL SAID WE 'SHOULD BE TURNING TO FINAL.' WE ACKNOWLEDGED THE CALL WITH AN IMMEDIATE TURN TOWARD FINAL. (AT THIS POINT; WE WERE APPROX 140 DEGS FROM FINAL APCH COURSE HDG). APCH THEN SAID; 'CHANGE OF PLAN; TURN L TO HDG 280 DEG VECTORS FOR RWY 19L.' WE ASKED APCH IMMEDIATELY ON 125.6 (SAME CTLR) IF WE NEEDED TO CALL. HE REPLIED IT WAS JUST A FREQ MIX-UP. AT NO TIME HAD WE BEEN TOLD TO GO TO TWR FREQ OR CALLED THE FIELD IN SIGHT FOR A VISUAL. I FEEL FREQ CHANGES WITHIN 6 MI OF THE ARPT (APCH CTL TO ANOTHER APCH CTL) WITH THE INTENTION OF A CLOSE-IN VISUAL APCH PROBABLY CONTRIBUTED TO A LESS THAN OPTIMUM RADAR HDOF AND CTL.