EmoStateUpdated vs EmoEngineEmoStateUpdated

What is the difference between EmoStateUpdated and EmoEngineEmoStateUpdated?

This is my code:

engine = EmoEngine.Instance;
engine.EmoStateUpdated += new EmoEngine.EmoStateUpdatedEventHandler(EmoStateUpdated);
engine.EmoEngineEmoStateUpdated += new EmoEngine.EmoEngineEmoStateUpdatedEventHandler(EmoEngineEmoStateUpdated);
engine.Connect();

void EmoStateUpdated(object sender, EmoStateUpdatedEventArgs e)
{
    //Do stuff
}
void EmoEngineEmoStateUpdated(object sender, EmoStateUpdatedEventArgs e)
{
    //Do stuff
}