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It's only going to be small % though, unless something is way off. So you're still training in the right area. If it reads higher outside and you're trying to hit indoor numbers you should finish a workout or interval knowing it could've been done harder, I'd just pick a power value slightly higher and ride to that, ie. if you're doing 4x10 @400 but you feel you've gas in the tank because your cranks are reading wrong, do them at 420. You'll soon know if that was the right move or not :) Or, for something completely different, stick tape over your headunit and just ride them where you think and then analyse the results.
But your question was calibration so unless you've got temperature compensating power curves for both units and can apply them live I think you're wasting your time worrying about small differences in accuracy.
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hippy
Ha
Indoor test. For riding outside but not racing just so I can pace efforts on climbs and TSS scores without having to do mental arithmetic.
My crank power meter reads slightly higher. Maybe I’d insignificant one the scheme of things