Usually you buy a starter box for one particular car/truck because you install small plastic pegs to match the chassis of the car/truck to where it needs to be on top of the box when you want to start the car/truck. This makes it easy to fit the flywheel to the starter wheel without anytrouble. one box can certainly fit both trucks, but the pegs wont line up for each truck because they have different chassis. Get it?
BTW: I love my starter box.