Liberty Dreadnaught and battleship

They are the same. They look the same, use the same model, and are practically the same. (I remember a Dreadnought means a all-heavy gun battleship while a Battleship is a more balanced ship, it could mean that a Dreadnought are all equipped with primary turrets while battleships use various turrets. But I didn't know.)

There is really no difference. I think they even use the same INI setup.