What is the difference between a double cork & a double rodeo on a snowboard?

What is the difference between a double cork and a double rodeo on a snowboard. When I see them done by a professional they look the same if you could give me a link to a video or something so I could see the cork and rodeo and a video showing step by step on how to do it so that I can learn to do it on my snowboard That would be greatly appreciated Thanks