AN ACR DC9 FLC RESPONDED TO ANOTHER'S CLRNC AND WERE CORRECTED; BUT IN THE CONFUSION DSNDED TOO LOW AT A VOR XING ON THE PROFILE DSCNT. APPARENTLY; NO CONFLICT.

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TORONTO CTR CLRED US FOR THE RWY 24 PROFILE DSCNT WITH AN ALT OF 13000 FT MSL APPROX 60 MI W OF YWT. WE CALLED OUT OF OUR CRUISE ALT TO DSND TO 13000 FT MSL ON THE PROFILE DSCNT; THEN WE RESPONDED TO A DSCNT TO A DIFFERENT ALT; 21000 FT. ANOTHER ACFT QUESTIONED OUR CLRNC BECAUSE IT WAS FOR THEM. TORONTO DIDN'T CORRECT OUR RESPONSE UNTIL THE OTHER ACFT (SIMILAR CALL SIGNS) CORRECTED THEM. AFTER THE CONFUSION WAS CLRED UP; TORONTO DSNDED US TO 11000 FT APPROX 25 MI W OF YWT. I SET 11000 FT IN THE ALT ALERTER AND THE CAPT ACKNOWLEDGED THE CLRNC (ALT). WE PROCEEDED TO CROSS YWT AT 11000 FT. THE CAPT (PF) THEN REALIZED WE WERE TO CROSS YWT AT 13000 FT THEN DSND TO 11000 FT AFTER XING YWT AS PER THE PROFILE DSCNT. TORONTO MENTIONED NOTHING ABOUT THE ALT. BECAUSE OF THE CONFUSION OF CALL SIGNS BY CTR AND NOT CORRECTING THE CLRNC; OUR ATTN WAS DIVERTED TO THE ALT 21000 FT THEN 13000 FT; THEN CLRED TO 11000 FT. I AM NOT SURE IN CANADA; IF AN AMENDED CLRNC LIKE 11000 FT OVERRIDES THE PROFILE DSCNT OF 13000 FT CLRNC. IT CAN BE VERY CONFUSING. SUPPLEMENTAL INFO FROM ACN 396690: WE GOT CONFUSED WITH AN ENSUING CLRNC AND CROSSED THE VOR AT 11000 FT; RATHER THAN INTXN GUELF AT 11000 FT.