Making white bread in my machine

Recipe calls for dry skim milk for making white bread in my machine. Can I substitute nonfat dry milk instead of dry skim

Yes. Nonfat milk and fat-free milk are the same as skim milk.

"Skim milk, (also known as fat-free or non-fat milk) contains no fat at all.".

Strictly speaking, the US government says nonfat milk can be labeled fat free or skim milk with under 0.5% fat.