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Classifiy 10g and 11g, these are marketing labels, no software versions like 10.2.0.1 and 126.96.36.199. Assuming you mean 10gR2 (10.2.0.x) and 11gR2 (11.2.0.x), there's technically no problem.
There's a support problem, 10gr2 is now out of Premier Support and in Extended Support. If you don't have an Extended Support contract, no support , no patches.
That could be bad for production environments.