Why dont people just answer the questions asked? :beer: to rockcrawlingredneck.
As for the why bother changing? Maybe he has that as a parts rig (so he can do it for free if they work), maybe he doesnt have the steel, the chop saw (plasma cutter) to do it him self.
Easiest thing to do is if you have access to both trucks is just go out and take a couple measurements. That should answer all your questions.