f350 vs f550 knuckles

Hey guys. I'm looking for a new work truck and i've found a 06 2wd F550 that will be getting a 12 valve and 4wd. I have a 06 F350 dana super 60 for it but it's only 8 lug. I need F550 hubs with 10 lug to match the back. Will F550 knuckles fit the F350 diff? Or will a F550 hub fit the F350 knuckle?

Correct me if i'm wrong, but i've read both diffs are 35 spline.

Thanks guys.

Overall axle width on 05+ 450-550's is wider. Not sure if it is the axle itself or if it is in the knuckles.

Hmmm.. I guess i'll have to put a tape measure on one.