No they won't fit. I'm not sure if they are the same as the GT Performance Pack 6P Brembos, but it has to do with mounting. The GT350 Brembos are radial mount (bolts through the top of caliper), so there is plenty of room to make an adapter bracket for the factory axial mount spindle and align the caliper to fit the diameter and center over the 15.5" GT350 rotors. The GT-PP Brembos (and Mach E) are axial mount (bolts in back of caliper), and the holes are probably in the wrong location to mount properly and fit the 15" GT-PP rotors.
Now I believe the Jeep SRT calipers are also axial mount, but I think the holes line up properly without need for an adpater.