Yes, there is a EM modified edition, I have never messured these engines so I can not tell the difference.
Do not forget that IDM and Serpent are names and an extra step in the road of distribution so that is making the price a bit higher.

I have seen Picco EVO4 engines sold for just 150 euro (minimum of 10 pieces), although the price is very interesting I have always doubts with the reliabillity of the Picco engines, I have seen to much.