I don't think either would kill a duck.
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This is probably in here somewhere, but I want to add that this evening my son and i were re-arranging some landscape stones inside our duck area and under every stone were several earth worms. Our ducks went crazy eating them! I dont know if the nutritional value of them but boy they enjoyed them.
Tomato leaves, eggplant leaves and all of the brassica family can be harmful to ducks. This is from a vetinary textbook I have on poisonous plants with reference specifically to animal groups. So that includes cabbages, broccoli, bok choi, cauliflower etc. Obviously it would be in larger amounts or build up over time. I have chosen not to feed anymore after having sick ducks with no other explanation.
I've heard that ducks LOVE when you put cut grass in their water dish, so I tried it and they do love it!!