Suddenly My Voice You Hear

They sound nothing alike when you actually listen to their voices, but for the life of me, I can't seem to distinguish between the two when looking at both their pictures.  Also, --no way I was going to attempt to draw Yoda and Cookie Monster myself. Speaking of voices, this is apparently what Americans sound like (For those of you who haven't already seen it)
Alt-Text: Eat the cookie, Luke.