For 1mm I wouldn't be concerned, its quite possible for such a disparity to develop through manufacturing process and normal use anyway. You may find Subaru advise to swap front to back across diagonal corners at every service. I have had two services where this has been done on my Forester and wear is very even across all four tyres. With 24,000 miles now covered there is still 4.5-5mm left on all four.
Agreed, 1 mm isn't enough difference to be concerned about - when I had my Outback, I rotate from to back every 10,000 miles, alternating between diagonal and same sides.
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