UPDATE: In the latest release of Select Journal from IOUG, there is an article titled "A DBA Foray into Open Source"...
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written by Sean Hull. Sean does mention an open source product called Oracle Schemadiff which does allow two schemas to be compared. I have not tried the product, and Sean even mentions that the last time it was updated was at the end of 2002, so it may not work with Oracle 10g, but it might be worth a try. Oracle Schemadiff can be downloaded here.
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