I'm new to all this but I have a set of both so I can tell you what I see as the differences!
1) The special blue ones are obviously annodized blue (duh!)
2) The flourine coating on the blue ones is actually a blackish colour vs. the grey colour of the others.
3) The shock shafts on my special blue dampers are a gold colour which I assume means they are Ti Nitride coated while the other shafts are just a silver colour.
I don't know if it makes any difference but I certainly can't tell the difference in feel between the two. Personally I like the 'bling' of the blue ones.
Hope that helps!