Does anyone know if one can mix-n-match a WS-X6748-GE-TX/ CFC with a WS-X6748-GE-TX/ DFC4 in a 6509-E chassis running a SUP 2-T?I know the WS-X6748-GE-TX/ CFC will work by itself and the WS-X6748-GE-TX/ DFC4 will work by itself, but will they work to...