As far as I can tell, the QWERTY keyboard in the leaked Sprint ROM is identical to the Diamond touch QWERTY (though a different colour - black instead of grey) BUT without the other 2 keyboards that are included in the diamond touch cab (i.e. Sprint leaked has regular Touch Keyboard and Keypad alongside new Full QWERTY).
Also, the QWERTY keyboard is VERY responsive in the leaked ROM - where the cab install can be laggy. All of this makes me think there is a slight difference between the 2 versions.... and a cab/OEM of the QWERTY from the leaked Sprint would be a more stable fit (of course I could be wrong
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Hope that made some sense :P
Richie