zarraz

Hi, I wanted to order some parts for my car which is an IS250 AWD f-sport, but was told that the parts are only for the RWD.
Here are the following parts I was going to order, can some one let me know if the 2 cars are so different that the parts are not interchangeable
TRD rear bumper diffuser, for the f-sport bumper, I was told by a vendor its only for the rwd and will not fit the awd, I taught the bumpers are the same, if someone can clearify

bbk, again there are several kits, but no one makes one for the awd, are the brakes that different, I was also told that the 4gs brakes fit, but they don,t have a awd brake kit either, if someone can help me out thanks