you can put a binding that fit a 93 waist on a ski with an 83 waist. the binding might stick out a little which may drag if you are cutting a turn really hard but otherwise it should be fine. you can also buy a new set of brakes that fit the new ski better.
as far as bindings go, you should let people know your size(weight) and more about your skiing if you want legit responses/opinions on what kind of binding would be best