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"Jar Jar was perhaps the most risky characters of all - not only because he would be entirely computer generated, but because he was the first truly comedic character ever to inhabit a Star Wars movie. "George told me that we were going out on a limb," [Ahmed] Best recalled. "See-Threepio was funny, but in a very formal way. And Chewbacca got some laughs, but he was basically just a big bouncer for the Millenium Falcon. Jar Jar was the first outright comic character." - Making of Episode One
Sorry, but they are worlds apart in concept. Lucas even admits as much.