Oh yes, for sure, but as others have mentioned, there is more blood in the area so they have to be more careful.
I wanted to also add that our shelter used to have to wait to spay previously nursing moms (kittens weaned) til their milk dried up enough but our current shelter vet loves to do flank spays, going in from the side. Of course, its more shaved area and more obvious, but it avoids the breast area and we dont have to wait as long til spaying the recent moms.