HDG TRACK DEV AND ALTDEV ALT EXCURSION.

Narrative

I WAS FLYING OUR COMPANY'S SECOND OF 2 TURBO SMT'S. ACFT Y WAS 10 NM AHEAD OF ME WHILE WE WERE TRYING TO CIRCUMNAV A LARGE LINE OF TSTMS. THE CTLR HAD JUST ASKED ME HOW MUCH FARTHER ON THE CURRENT HDG I WAS GOING TO CONTINUE. I RESPONDED THAT I WAS IN COM WITH ACFT Y AND WE WERE MAKING A NEW PLAN. WE DECIDED TO DEVIATE TO DBQ AND REFUEL. I ASKED THE CTLR FOR DIRECT DBQ AND LOWER. AT THE SAME TIME; THE AUTOPLT DISENGAGED AND I WAS PULLING DBQ FROM MY PLATES. HE CLRED ME DIRECT DBQ AT 13000 FT. I RESPONDED THAT I WAS TURNING DIRECT DBQ DSNDING TO 13000 FT. A FEW MINS LATER; A NEW CTLR CAME ON FREQ AND ASKED WHERE I WAS GOING. I TOLD HIM DIRECT DBQ AT 13000 FT. HE WAS NOT THE ONE THAT ASSIGNED IT BUT WONDERED IF I MIGHT HAVE REQUESTED IT UNDER Y'S NUMBER; WHO WAS NOT ON THE FREQ YET BUT WAS DOING THE SAME THING 10 MI BEHIND ME. I WAS NOT SURE AT THE TIME; DUE TO THE FACT I WAS EXTREMELY BUSY. I HAD ONLY 20 NM TO GET DOWN FROM 220 WAS HAND FLYING THE AIRPLANE; PULLING PLATES OUT; GETTING ATIS; AND HAD JUST FLOWN ACFT Y 2 DAYS BEFORE. ACFT NUMBERS ARE CLOSE IF YOU'VE BEEN FLYING THE OTHER ONE THE DAY BEFORE. I RPTED DBQ IN SIGHT AND REQUESTED A 360 DEG TURN TO LOSE ALT. I WAS ASSIGNED 5000 FT BUT CAN'T REMEMBER IF I WAS CLRED FOR THE VISUAL APCH AFTER RPTING THE ARPT IN SIGHT. A 360 WAS APPROVED AND I WAS SWITCHED TO TWR. THERE COULD BE A POSSIBILITY THAT I USED ACFT Y'S NUMBER WHEN MAKING MY ORIGINAL REQUEST. ACFT Y WAS 10 NM BEHIND ME AND ON A DIFFERENT FREQ. I WAS VERY BUSY WITH ALL THE THINGS I HAD TO DO IN PREPARATION FOR LNDG INCLUDING HAND FLYING THE AIRPLANE BECAUSE THE AUTOPLT WAS INOP. THE CTLR TOLD ME THIS DID NOT CREATE A PROBLEM BUT A PLT SHOULD REMEMBER WHICH AIRPLANE HE'S FLYING; ESPECIALLY WHEN THERE ARE THE SAME TYPE AND YOU ACTIVELY FLY THEM ALL.