Here is a one piece Mustang rotor made by EBC and a two piece Pantera rotor. You can see that everthing is the same as far as the rotor thickness, the backset distance from the face of the hat to the disc, and the size and position of the bearing races. The only difference is the size of the studs.
You can see that the Pantera stud is made for a two piece rotor because it has two shoulders, one to pass through the rotor and the other to go into the hub. the shoulder at the base of the stud is too large to press into the mustang rotor hole and the second (knurled ) shoulder is too small.
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