CL65 CREW FLEW WHAT WAS PROGRAMMED; WHICH WAS THE WRONG SID; WHEN DEPARTING ONT.

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PRIOR TO DEP FROM ONT; THE FO AND I REVIEWED OUR RTE OF FLT BTWN THE FLT MANIFEST AND WHAT WE HAD PROGRAMMED INTO THE FMS. THE FLT PLAN (RELEASE) LISTED THE PRADO SIX (PRD06.PDZ) AS OUR SID. THE FO RECEIVED FROM CLRNC DELIVERY THE POMONA SIX (POM6.POM) DEP; BUT HAD WRITTEN IT DOWN AS 'P6.' I WAS ABSENT FROM THE COCKPIT DEALING WITH A MAINT ISSUE WHEN THIS CLRNC WAS READ BACK. WHEN I RETURNED TO THE COCKPIT; WE REVIEWED THE CLRNC AND I STATED 'PRADO SIX' AS THE SID. NEITHER THE FO NOR I CAUGHT THE FACT THAT 'P6' MEANT POMONA SIX; NOT THE PRADO SIX; WHICH WAS ENTERED INTO THE FMS. CONSEQUENTLY; WE DEPARTED RWY 26L AND BEGAN A L TURN TO PDZ VOR; WHICH WAS NOT WHAT ATC WAS EXPECTING. I DON'T KNOW IF WE CREATED A TFC CONFLICT; AS OUR TCASII HAD BEEN DEFERRED AND WAS NOT OPERATIONAL. IN THE FUTURE; I WILL NOT EVER BE ABSENT AGAIN WHEN THE CLRNC IS OBTAINED. SUPPLEMENTAL INFO FROM ACN 579145: NEITHER THE CAPT OR MYSELF HAD BEEN TO ONTARIO BEFORE. WE WERE UNFAMILIAR. WE WERE RUSHING TO LEAVE ON TIME. HOWEVER; WE DID BRIEF THE DEP WE WERE FILED FOR. IT HAPPENED TO BE THE PRADO SIX DEP. I THEN PROCEEDED TO PICK UP OUR IFR CLRNC. WE WERE ASSIGNED THE POMONA SIX DEP. THE 2 DEPS SOUNDED A LOT ALIKE AND NEVER CROSSED MY; OR THE CAPT'S; MINDS IT WASN'T THE ONE WE HAD BRIEFED. WE FINISHED LOADING AND THE CHKLISTS AND WERE ON OUR WAY. I BEGAN FLYING OUR FILED DEP AND WE WERE QUESTIONED ABOUT OUR HEADING BY DEP. WE THEN REALIZED WE WERE ON THE WRONG DEP. I CONTINUED TO FLY THE HEADINGS AND ALTS GIVEN BY ATC WHILE THE CAPT TALKED TO ATC TO FIGURE OUT A SOLUTION. THERE NEVER SEEMED TO BE ANY CONFLICTS WITH OTHER ACFT; AND ATC WORKED THEIR MAGIC TO GET US TO DENVER. OVERALL I BELIEVE THE PROBS WERE COMPLACENCY AND MISCOM; ALONG WITH OUR LACK OF ATTN TO DETAIL. A CONTRIBUTING FACTOR ALSO MAY HAVE BEEN THAT I WAS TIRED. I GOT UP AT XA45 AM CENTRAL TIME TO COMMUTE TO WORK THAT DAY!