I just swapped my KX 500 supermoto over to a YZ/WR. Nothing is a straight swap. You can get away with new spacers on the front wheel but the rotor offset is off slightly so you would have to modify the relocation bracket.
The rear wheel is all wrong. Including the axle size. I bought RAD wheels with the universal hex hubs, they have adapters for swapping wheels from bike to bike. I bought front spacers and the rear carriers for the rotor and sprocket, spacers too. The universal wheels are the way to go.