Bonnets, bumpers, indicators, fenders, cosmetic bits can all be swapped amongst KE3x and KE5x models. Pretty much, the only thing that you can't swap is the doors and boot lids, almost everything else is the same cosmetically.... drivelines and underbody components are different, but can be swapped as a whole piece (eg Discs and calipers, 4k)...
Hope that helped (my whole lot of b/s for the day, please correct me if I'm wrong).