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If you are considering the order for spares then we can go for set of 12 wine glasses if there is no difference between set of 6 glasses and 12 glasses.

Comments  

If you are considering the order for spares, we can get the set of 12 wine glasses if there is no difference between the glasses in the 6-glass set and those in the 12-glass set.

I am not sure what "If you are considering the order for spares" means. Maybe "As to the order for spares, we can get the set of 12 wine glasses if there is no difference between the glasses in the 6-glass set and those in the 12-glass set.