Animation = FX. They're both computer graphics. Animation is no cheaper than good FX, except that animated shows use cheaper fx for the entire show so you don't notice the difference.
Not necessarily. If the show is primarily 2D, then the most that's gone with computers is coloring/shading and CGI ships. If it's a Clone Wars/Tron Uprising/Transformers Prime type deal, then yes, it's mostly computer graphics.