Recommended way to go down from 10.2.0.4 to 10.2.0.3?

We have a working 10.2.0.3 environment. We have been asked to test the 10.2.0.4 version in the same environment rather than a parallel environment. What is the least risky method of reverting to 10.2.0.3 if we are asked to roll it back?

The safest route in your case is to clone you existing instance and then upgrade the clone to 10.2.0.4. If there are issues found, you simply drop the 10.2.0.4 instance. If not, you can drop the old 10.2.0.3 instance or upgrade it to 10.2.0.4 (and drop the 10.2.0.4 clone).
I doubt anybody on here can specifically give pointers to any issues, mostly because downgrades are rare and no one on here has exactly the same system (in terms of patches) as you do.
On the other hand, 10.2.0.4 is the most stable release of 10gR2 and you should not encounter any issues.
Do you have a valid basis for your concerns ?
HTH
Srini

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