I flew on this plane BOS-LIS last week, and can confirm that rows 7-18 do appear to have some extra legroom in coach compared to rows 19+. The seats are white, and the regular seats are blue.

Interestingly, when checking in for my return on the same flight, those seats were offered at EUR60 (the price for extra legroom seats) instead of EUR35. I wonder if, once they confirm the aircraft they are using for the flight, they end up charging more for the extra legroom.

On the return, I was able to buy-up to business at the airport, and I have to say those seats were great!