Diff in output between 11.2.0.1 and 11.2.0.3

11.2.0.1

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AL32UTF8
SQL> set heading off;
SQL> set colsep "";

SQL> SELECT '1V4A',sysdate from dual;

1V4A31-JUL-12

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11.2.0.3

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AL32UTF8
SQL> set heading off
SQL> set colsep ""
SQL> select 'AAAA',sysdate from dual;

AAAA 12-07-31

there are spaces between 'AAAA' and '12-07-31'

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Why is it that there is a difference in Output with an extra space in 11.2.0.3? CURSOR_SHARING is exact on both instances.

Thanks,
Anand