I have two green lenses, and they each do have a slightly different tint.

Like you say, the blue lenses vary more -- I've usually got 4 empegs on my desk at work (a mk1, a pair of mk2s and a mk2a). They're all different colours. I suspect that at least one of them doesn't have the AR coating, though.

I might take a picture at some point -- one of the empegs is at home today.