Hmmmm... the XT line is supposed to be more stiff, if only slightly RA-65 to 63). The XT is heavier (11.9 to 11.6) but slightly more headlight balanced (32 to 32.7), but the swingweight is Xt-317 to Orig-324 in TW's Racquet Comparison Tool.
I have a graphene original (non-xt) radical mp and I like it a lot. I was hoping for a prestige mp with a little more control to pair up with it. The prestige line is more know for control.