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I would say if the tyre is the same make and model with the same tread compound front and rear, there shouldn't be a problem. BMW has 19/20 and 20/21" combinations front and rear on the G8x M models and this is a common configuration on Corvettes, in our track club we have this type of setup on quite a few cars with no handling issues.
Going from a square setup to staggered setup with about 10% increase in rear treadwidth compared with changing the sidewall height by 10% will likely have similar affects on the handling from an understeer/oversteer perspective, but neither should cause any drastic affect.
From an insurance perspective, most US insurers seem to be fairly blase about this type of change compared with UK insurers, from what I know.
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