I haven't used the CS for Fallout really, so I'm unfamiliar with how the scripting works with functions etc.

Is it likely that function names will be the same (obviously with lots of new functions hopefully).

I have lots of mods for Oblivion that would work well in Skyrim also. It would be great and cut down on lots of work if I can just copy and paste the scripts over and just change the obvious things like references, item names etc.

Anyone know the possibility of this based on how Fallout CS works?

I could've sworn they said they redid their scripting tool (or whatever you call it). So I would say no, but it's only speculation. You won't really know until we have the actual Skyrim CS.