I know this is an old thread but I thought I would let you know about a little project...
My n910f bit the dust recently and we have managed to get hold of a brand new n910c mainboard. We're going to see if it fits inside the n910f. If it does, I maybe the only owner of such an hybrid.
I'm going to be putting a new screen on it too just to get rid of a bit of notification screen burn which has been bugging me.
I just hope that when it comes to installing firmware it doesn't mess up with OTA missmatches