CAPT OF A FOKKER 100 FOLLOWED THE WRONG SID DEP DURING CLB AFTER TKOF RESULTING IN ATC INTERVENTION TO BRING HIM BACK ON TRACK.

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I RPTED TO ACFT. WE DID CHKLIST AND BRIEFED DEP. AFTER PUSHBACK; WE WAITED IN ALLEY FOR A FEW MINS SINCE WE FELT A LITTLE RUSHED. WE AGAIN REVIEWED FLT PLAN -- TKOF PWR SETTING AND DEP. FO STATED WE WERE CLRED AS FILED VIA DORVAL 4. WE TAXIED TO RWY 28; TOOK OFF; TURNED TO 320 DEGS AND CALLED DEP. AS WE ROLLOUT OUT OF 320 DEGS; DEP TOLD US TO RETURN TO RWY HDG AND SAID TWR MUST HAVE CHANGED OUR DEP. I ASKED IF THERE HAD BEEN ANY CONFLICTS AND DEP SAID NO PROB AT ALL; JUST THAT THE NOISE ABATEMENT PEOPLE MIGHT BE A LITTLE UPSET. CLBING THROUGH 10000 FT; I ASKED FOR CLRNC FO HAD COPIED. FO HAD WRITTEN IT DOWN SINCE THERE WAS NO PDC. HE HAD WRITTEN DORVAL 2; BUT SOMEHOW TOLD ME DORVAL 4. IN SPITE OF OUR BEST EFFORTS TO WORK AS A CREW; I OVERLOOKED THE NEED TO VERIFY CLRNCS. ADDING TO PROB IS USE BY YUL OF SIMILAR SID TITLES WITH DIFFERENT DEPS -- DORVAL 2 AND DORVAL 4. MAYBE THEY SHOULD RENAME ONE OF THEM. WE ALSO HAD A MOMENTARY DISTR DURING DEP RESULTING IN LATE CALL TO DEP OTHERWISE WE NEVER WOULD HAVE MADE THE TURN.