AN ACR PIC CREATES A PROB FOR ORD GND CTLR WHEN HE USES THE WRONG TXWY FOR THE NORTHPORT TERMINAL; ORD; IL.

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NORMAL FLT APCH AND LNDG AT ORD RWY 27R. A COMMUTER ACFT LANDED ON RWY 22R. I CLRED RWY 27R AT TXWY C. THE COMMUTER CLRED RWY 22R AT TXWY C BEHIND ME. TWR GAVE US TAXI INSTRUCTIONS AS WE WERE CLRING THE RWY AND IN THE PROCESS OF XFERRING CTL AS IT WAS THE FO'S LEG. NORMAL PROC LNDG ON RWY 22R OR RWY 27R IS TO CLR RWY AND TAXI IN TO OUR GATES AT THE 'NORTHPORT.' AS I CLRED AT TXWY C; I MADE A HARD L TURN TO GO IN TO NORTHPORT THE COMMUTER CAME CLOSE UP BEHIND ME. GND SAID THEY HAD WANTED US ON TXWY B BUT TO GO IN TO NORTHPORT. TWR WANTED ME TO CALL THEM. I DID. HE SAID WE WERE GIVEN INSTRUCTIONS TO GO ONTO TXWY B. I DID NOT HEAR THEM. FACTORS: LAHSO'S WITH ACFT CLRING FROM 2 RWYS ONTO THE SAME TXWY. FO BEING NEW (3 MONTHS ON LINE) MIGHT NOT HAVE UNDERSTOOD TAXI INSTRUCTIONS OR BEEN RELUCTANT TO CHALLENGE CAPT THAT WAS FAMILIAR WITH ORD. TXWY B AND THE CONCOURSE TAXI LANE BEING CLOSE TOGETHER AT THIS POINT. CREW NOT HEARING AND UNDERSTANDING TAXI CLRNC. NO EVASIVE ACTION TAKEN. WILL MAKE SURE I KNOW EXACTLY WHAT CLRNCS WERE GIVEN AND NOT RELY ON PAST PRACTICES.