ACR LGT SQUAWKED THE WRONG XPONDER CODE AND LEVELED OFF AT THE WRONG ALT WHEN THE WRONG FLT PLAN WAS UPLINKED TO THEIR ACARS.

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ON KEWR RWY 22 SID INVALID DEP INFO WAS UPLINKED VIA ACARS. I.E.; 2000 FT LEVEL OFF; INSTEAD OF SID ALT OF 5000 FT; INCORRECT XPONDER SQUAWK AND DEP CTL FREQ. THE ERROR WAS DISCOVERED WHEN WE FINALLY GOT IN CONTACT WITH ZNY. ZNY QUESTIONED US AS TO OUR LEVEL OFF ALT AND INCORRECT SQUAWK. WE CONTINUED TO THE CORRECT ALT AND ATC ASSIGNED HDG TO DEP RTE. ON FURTHER INVESTIGATION WE FOUND THAT ACARS HAD UPLINKED THE PREVIOUS LEG'S DEP PROCS (6 HRS PRIOR) TO OUR FLT XXY OUT OF KEWR. HOW THE PREVIOUS DEP WAS UPLINKED TO OUR FLT WHEN THE CORRECT FLT NUMBER; AND DEP/ARR STATIONS WERE PROGRAMMED IS STILL UNKNOWN AT THIS TIME. CORRECTIVE ACTIONS AT THIS TIME ARE TO MAKE THE COMPANY AWARE OF THE POSSIBILITY THAT THIS CAN HAPPEN AND ALLOW ADDITIONAL TIME AND ATTN TO CHK ANY UPLINKED ACARS DATA. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE PRE-DEP CLRNC RECEIVED WAS ADDRESSED TO THE CORRECT ACFT BUT THE CREW DIDN'T NOTICE THAT IT WAS ADDRESSED TO THEIR PREVIOUS FLT NUMBER. RPTR HAS TRIED SINCE THEN BUT HAS BEEN UNABLE TO CAUSE THIS INCIDENT TO REPEAT ITSELF. HE CAN'T EXPLAIN WHY THE OLD; OBSOLETE FLT PLAN WAS FORWARDED TO THEIR ACFT.