CRITICAL AIRBORNE CONFLICT OCCURS BTWN 2 E145'S DEP PARALLEL RWYS IN A NIGHT OP 2 NM S OF CLT; NC.

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OUR ACFT RECEIVED TCASII NOTIFICATION FOLLOWED BY RA DURING DEP FROM RWY 18R AT 1.4 DME; APPROX 3300 FT. UPON RECEIVING TCASII NOTIFICATION; WE SAW THE ACFT DEPARTING ON RWY 18L TURNING SLIGHTLY TO THE R. AS THEIR TURN INCREASED; A RA WAS MADE. I; THE FO; LEVELED OFF AND TURNED TO THE R TO AVOID THE ACFT. AS SOON AS WE BEGAN OUR TURN; THE TWR CAME ON THE RADIO AND SAID 'ACFT X; ARE YOU STILL ON TWR?' THE CAPT VERIFIED THAT WE WERE; AND THAT WE WERE DEVIATING TO THE R. THE CTLR THEN STATED TO MAINTAIN 3000 FT AND TURN TO 270 DEG HDG. AS WE HAD ALREADY PASSED THROUGH THAT ALT; I BEGAN TO DSND. SHORTLY AFTER; HE ASKED US TO MAINTAIN 4000 FT. BY THIS TIME; THE OTHER ACFT WAS DIVERGING FROM OUR COURSE. THE PROB WAS CAUSED BY THE ACFT DEPARTING RWY 18L AND TURNING R INTO OUR DEP PATH FROM RWY 18R. AS THEIR SEPARATE TWR FREQS FOR RWY 18L AND RWY 18R; I DO NOT KNOW WHETHER THE ACTIONS OF THE OTHER ACFT WERE BASED ON ATC OR THE PLT MAKING AN IMPROPER TURN. SUPPLEMENTAL INFO FROM ACN 580907: DEP FREQ WAS 120.5. THIS FREQ IS MOSTLY USED AS THE W DEP FREQ; BUT IS SOMETIMES USED IF ONLY LIGHT ACFT DEP LOADS LEAVING CLT. TOOK OFF RWY 18L AND FLEW THE PANTHER 5 DEP. CONTACTED DEP ON 120.5; AND HE SAID TURN R TO 250 DEGS. STARTED TO TURN; GOT TO ABOUT 220 DEGS; THEN WE GOT TCASII RA STATING 'CLB; CLB.' IMMEDIATELY CLBED AND STARTED A L TURN TO AVOID CONFLICT; THEN DEP SAID; AFTER WE RESPONDED TO THE RA; TO TURN L TO 130 DEGS AND CONTACT DEP ON 124.0. FOUND OUT LATER AFTER A PHONE CALL TO ATC; THAT A VERY SIMILAR CALL SIGN COMPANY ACFT HAD DEPARTED BY RWY 18R; AND DEP CTL MUST HAVE THOUGHT WE WERE HIM; BUT WHEN WE READ BACK THE TURN TO 250 DEGS; HE DIDN'T CORRECT US. ALSO; FOUND OUT THE FO READ BACK THE WRONG DEP FREQ; AND CLRNC DELIVERY DID NOT CORRECT US EITHER. SO; THE PERSON ON 120.5 WAS NOT EXPECTING A SIMILAR SOUNDING CALL SIGN ON HIS FREQ; AND DIDN'T CORRECT US ON OUR ERROR.