I'm pretty sure they are the same. Worst case, contact TWM tomorrow to make sure. Keeping the P5 or trading it in and parting out? If the latter what might you be selling?
+1. the only difference is the depth of the knob section. if you plan on using the pro5 TWM shifter with the MSP knob, it "May" not thread on all the way. (or at all) if you are using an aftermarket knob, such as the TWM knob, it will work 100%.