How off are they AFRs? At idle mine was average 14.4 bank 1 and 14.7 bank 2. If it's something like this I really wouldn't be worried about it. I searched for a good bit trying to find Intake leaks/ exhaust (header) leaks that could affect the sensors but I never found anything. Probably just something really small that's making the difference and would be difficult to find if it's only a small difference in AFRS. Like posted above the reading coming from those sensors can be iffy too.
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Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.
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