in short no.
it is likely due to be a curvature type change as far as the motors are concerned and not a linear change, theoretically a servo should operate linearly but remember that they still operate with motors ie. coils of wire.
because its such a small change in voltage, you may get away with it not causing too much drift to one side, its likely you may have had a slight drift to start with that you didnt notice. its the type of thing where a greater change will produce an even greater effect, the only way to really know if it will work for you is to test it yourself.