I see both Clone Wars series like npgcole. Definitely not a remake, I consider it more like an expansion to the Cartoon Network series. The only thing that is really changed is that the bounty hunter Durge is replaced with Cad Bane in the new ones, that was confirmed I believe.
What I don't know is when Ahsoka became Anakins padawan. Could very well be after the events of the first series. I don't really remember how that one ended...