Assming your talking strickly trucks...
Biggest difference is 10 bolt is way wider than the other
10 bolt is a 5 on 5 lug or 6 lug
10 bolt could be rear or front steering axle
D35 is a 5 on 4.5 lug unless it has coil buckets then it could be 5 on 5 lug
D35 is rear axle only
All 10 bolts ever made will have leaf spring perches factory unless it is a 2wd chevy rear, then again, it will be a lot wider.
some 10 bolts were found in passenger cars, all of these will be a 5 on 4.75 bolt pattern, most with leaf perches, some with coil buckets.