I wouldn't expect to have any trouble with the swap. Unlike the 318 which is sort of 400 in camouflage, the 317 is still a genuine 300 series CPU. It's just got more of everything. It's going from a 318 to a 317 where you've got to watch out.
I'll have a look at the details of any differences when I'm back at work tomorrow and if there are any significant differences (negative OR positive) I'll post them.