TWO LOW TIME PLTS FLYING TOGETHER IN TWO SEPARATE ACFT ARRIVE AT COLUMBUS; OH. ONE LANDS ON THE INCORRECT RWY; THE OTHER OVERFLIES THE ARPT WITHOUT CLRNC.

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BOTH CESSNA 172'S WERE COMBINED ON ONE VFR FLT PLAN WITH ACFT #1 HANDLING THE RADIOS. COLUMBUS APCH INSTRUCTED BOTH CESSNAS TO PROCEED INBOUND FOR RWY 28L. THE CESSNAS WERE APCHING FROM THE N. APCH ALSO INSTRUCTED THE FLT TO CONTACT TWR. COLUMBUS TWR TOLD THE FIRST CESSNA TO BEGIN A DOWNWIND FOR RWY 28L. THE FIRST CESSNA WAS ON THE N SIDE OF THE ARPT; PARALLELING RWY 28R AS INSTRUCTED BY ATC. THE SECOND CESSNA WAS 3 MI BEHIND AND LOST SIGHT OF THE FIRST CESSNA; AS WELL AS THE POINT WHERE THE FIRST CESSNA TURNED DOWNWIND. THE SECOND CESSNA DID NOT TURN DOWNWIND BUT CUT ACROSS BOTH RWYS FOR A L DOWNWIND FOR RWY 28L. AT THIS TIME CESSNA #1 CALLED ATC AND ASKED WHETHER IT WAS CLRED FOR RWY 28L. ATC RESPONDED; 'NO; AND WE'LL CALL YOUR BASE.' CESSNA #1 UNDERSTOOD THIS TO MEAN THAT IT WAS LNDG ON RWY 28R. WHEN THE SECOND CESSNA CUT ACROSS THE AIRFIELD; ATC QUESTIONED THE FIRST CESSNA; STILL ON DOWNWIND; AS TO THEIR FLT'S INTENTIONS; AS WELL AS CLRING IT FOR LNDG ON RWY 28L. THE FIRST CESSNA REPEATED BACK THE CLRNC FOR RWY 28L; BUT IN THE CONFUSION AND MISUNDERSTANDING ABOUT CLRNC FOR RWY 28L DID AN APCH FOR RWY 28R AND LANDED. THE SECOND CESSNA; ALSO CONFUSED; FLEW L DOWNWIND FOR RWY 28L AND LANDED ON RWY 28L. UPON LNDG COLUMBUS TWR INFORMED THE FIRST CESSNA OF THE INCORRECT RWY IT LANDED ON AND INSTRUCTED THE PLT TO GIVE TWR A CALL. TWR ALSO OFFERED THE SAME REQUEST FOR THE SECOND CESSNA. THE PLT OF THE FIRST CESSNA CALLED TWR AND WAS INFORMED OF THE ERRORS MADE. TWR ENSURED THE PLT THAT NO ACTION WAS GOING TO BE TAKEN AND THIS WAS JUST A LEARNING EXPERIENCE. BECAUSE THE FIRST CESSNA WAS RESPONSIBLE FOR THE FLT PLAN THE SECOND CESSNA PLT DID NOT CALL TWR.