If your CDROM says 9i Release 2 (9.2.0), then you have version 9.2.0. If it says Oracle 9i (9.0.1), then you have 9i Release 1. They are different vesions, but both are referred to as Oracle 9i.
As for compatibility, all the 9i Release 1 (9.0.1) functionality should also be available in 9i Release 2 (9.2.0). However, 9i Release 2 added some functionality that is not available in 9i Release 1.
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