Both are components of Samsung Voice, as can be seen if you open the Voice Command app. Command is used to give voice instructions to the handset, while Talk is a text-to-speech interpreter. Google Voice is a separate application with similar functionality.
Btw, there's normally no need to "bump" topics, especially when similar threads already exist. Forum visitors see unread topics marked bold so they're easily found, and will respond if they have something useful to contribute.