Wondering

I watched both Ghiblies 1 and 2 and noticed that most of the events of Ghiblies 1 is in Ghiblies 2 as well. Is it even neccessary to watch Ghiblies 1, since its events are also in Ghiblies 2?

http://www.veoh.com/videos/v4966154yjAHTbN

Best thing ever.