Any difference between C10 & C20 Rearends?

[D-n-Tyke]

Follow up to my other post in regards to front end differences. Thanks again for those reponses.

Now I am trying to figure out if there are any differences between a C10 and C20 rearend (other that the bolt pattern in the axle flange and drums) . Trying to convert from 8 lug to 5 lug. I know I can buy the conversion kit that comes with new axles and new drums, but I might have access to a 1970 C10 rearend. So if they are the same I think swapping the rear end might just be the easier.