A LEAR 36 FLT CREW INADVERTENTLY LANDS ON THE WRONG RWY.

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THE EVENT WAS TERMED 'PLTDEV.' INADVERTENT LNDG ON THE WRONG RWY. WE WERE RETURNING FROM (LEBB) SPAIN. THIS WAS OUR LAST STOP FOR A CREW CHANGE SO AS TO CONTINUE TO OUR DEST; VAN NUYS; CA. CONCERNED ABOUT OUR TURN-AROUND TIME; ATIS REPORTED THE ILS RWY 4R AND VISUAL RWY 4L WERE IN USE. OUR INTENDED FBO INDICATED A LNDG ON RWY 4L WOULD EXPEDITE OUR TAXI TIME. I INSTRUCTED MY COPLT TO REQUEST THE VISUAL RWY 4L APCH. THE APCH CTLR ADVISED US HE COULD NOT ISSUE THE VISUAL; BUT THE TWR CTLR COULD ISSUE THE SIDE STEP VISUAL RWY 4L. STILL WITH THE APCH CTLR; BEING VECTORED; TFC WAS CALLED AND SIGHTED. WE WERE INSTRUCTED TO CONTACT THE TWR. THE TWR CLRED US TO LAND RWY 4R AND MY COPLT ACKNOWLEDGED THIS. I CORRECTED HIM ON HIS MISTAKE AND HE THEN ASKED FOR THE VISUAL RWY 4L. BELIEVING BEING CLRED; I SIDE STEPPED AND LANDED VISUAL RWY 4L. UPON LNDG AND TAXI; I WAS ASKED TO CALL THE TWR. THAT WAS MY FIRST INDICATION SOMETHING MIGHT BE WRONG. I CONTACTED THE BOSTON TWR SUPVR. HE INFORMED ME AFTER HE REVIEWED THE RECORDING TAPES; THAT THERE HAD BEEN A TWR CTLR CHANGE JUST AFTER WE HAD BEEN GIVEN CLRNC TO LAND. I BELIEVE THIS MIGHT HAVE CAUSED THEM NOT TO RECEIVE OUR REQUEST. TAXIING ACFT ON THE GND WERE CLRED TO TAXI ACROSS THE APCH END OF RWY 4L. I HEARD THIS CALL AND ALSO HEARD THE TWR CTLR CALL US; AS LEARJET TFC LNDG; 3 MI FINAL. THIS FURTHER ASSURED ME I WAS CLRED TO LAND RWY 4L VISUAL. THE THRESHOLD IS DISPLACED SOME 1500 FT OR MORE; CAUSING US TO BE QUITE HIGH AT THE APCH END OF RWY 4L. NO CONFLICT WAS IMMINENT AS THE TFC HAD ALREADY CLRED. I FEEL IF I HAD CORRECTED THE RADIO CALL MYSELF; AND THE TIMING CHANGE OF THE TWR CTLR BEEN A FEW SECONDS EARLIER OR LATER; THIS COULD HAVE BEEN AVOIDED.