As long as the outside diameter (and circumference) are the same, the width does not matter. If there is a diametrical difference either on on the same axle on between front and back are different it WILL contribute to accelerated wear of the drive train components, particularly the clutches. The larger the difference the larger the wear increase. Obviously there is some tolerance since tire pressure differences also change the rolling diameter.
The exception would be the new 4wd systems that are designed to be able to run on rear wheel drive only (M-cars).
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F06 M6 Grand Coupe CP
Sapphire Black Metallic
The drive is the destination
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