CTLR TRANSPOSED FLT NUMBERS OF SIMILAR A/N AND DESCENDED WRONG ACFT.

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SHORTLY AFTER BEING CLRD TO CROSS PIVIT AT 11000' AND 250 KTS; AND BEING SLOWED TO 280 KTS FOR DES; WE WERE CHANGED TO ANOTHER APCH CTL FREQ. UPON INITIAL CONTACT; APCH SAID TO DELETE THE SPD AT PIVIT. I INQUIRED AS TO WHAT SPD THEY WOULD LIKE FOR XYZ. APCH RESPONDED; 'XYZ; SLOW TO 230 K AND DES TO 5000'.' I ACKNOWLEDGED. LATER WHEN DSNDING THROUGH APPROX 10500'; APCH ASKED MY ALT AND SAID; 'YOU WERE ONLY CLRD TO 11000'.' A SHORT DISCUSSION ENSUED AND WE LEVELED OFF AT 10000'. LATER I PHONED THE APCH SUPVR AND WAS INFORMED THEY WERE CHKING THE TAPE. I CALLED BACK LATER AND THE SUPVR SAID; 'YOU WERE CLRD TO 5000'; THE CTLR MISTOOK YOU FOR COMPANY YXZ.' IT IS JUST HUMAN ERROR; AND LUCKILY NO HARM WAS DONE. HOWEVER; IT COULD JUST AS WELL BEEN MY ERROR. BUT; I'M SURE AS A PLT; I WOULD BE FINED OR GIVEN DISCIPLINARY ACTION BY THE FAA IF IT HAD BEEN! MY POINT IS; WE ARE ALL HUMAN; AND WE ALL MAKE UNINTENTIONAL MISTAKES! LET US USE THE POWER OF THE GOVERNMENT TO STOP FLAGRANT MISUSE AND VIOLATIONS OF THE LAW AND RULES; BUT NOT FOR SIMPLE HUMAN MISTAKES. I CERTAINLY DON'T WANT ANY FINES FOR MYSELF OR ANY APCH CTLR FOR A HUMAN ERROR. THAT WOULD SERVE NO PURPOSE! BOTH OUR TIME AND EFFORTS COULD BE PUT TO MUCH BETTER USE.