Storey's Guide to Raising Ducks.
Worth twice the price!
You can preview up to, I think 50 pages before you get locked out online (don't know the url but someone on this forum told me about it).
I have found a few differences in raising ducklings and chicks, such as ducklings' way of splashing around with their water more, and making it messier, and I don't think medicated feed is a good thing (there are those who disagree), and ducklings need three times more niacin in their feed. They all need warm temperatures (I find the recommendations are a bit different for the two), clean, dry bedding, safety from predators, clean water, nutritious food, and regular, patient attention.