Alternator belt sizes

Altezza-Dan

Octane Boostaholics
I got two replacement GAtes belts today for power steering and alternators except motor factors only had a 5pk880 whereas the one thats on it is a 5pk882, will the 2mm shorter difference make a difference to anything?
 
880 belt went on mine the last time I changed mine. Not had a problem with mine in the year it's on the car.
 
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