There are some key differences legs, head size, teeth, duriel is like 3x the size.... but yea, they have a similar design. Duriel would kick a hydralisks ass no problem though.
I always thought Duriel had the best corpse:)
Don't forget about all the maggots that crawl out afterwards
http://www.youtube.com/watch?v=1lu2N3DZS0Y
Don't forget about all the maggots that crawl out afterwards