The ones I have on my Rustler I'm almost 100% sure are MIP but they are more like THIS design which I think is probably better because less rotating mass? Take a look and see what you think.
I didnt realize that the bandit and rustler used the same chassis. learn something new everyday :)
The Stampede and Rear Rustler arms are the same length but the Rustler front arms are shorter than the stampede. Pede's front arms are same length as its rear arms.
Definitely get the steel CVDs. I've got some from MIP on my Rusty, they probably make em for the Bandit too. I dont know all the parts that are interchangeable but like Johnny said I think its mostly the chassis and arms that are different. I'm guessing drive shafts and CVDs are different too...