Not sure what "Suck Eggs" are…We looked into this with my sensitvies, the one difference we saw was no vitamin c in Suck eggs. Am sure theres other slight differences but that was the obvious

But for Duck eggs, they contain more Vitamin A,B and E, Iron, Selenium and Sulphur than chicken eggs, here's a nice table i found:
https://www.healthline.com/nutrition/duck-eggs-vs-chicken-eggs#nutritional-comparison
My suspicion is the Iron may cause additional water to accumulate in the digestion tract causing the fertilizer to liquefy…

The Sulphur (Thiamine!) and Selenium compounds will happily turned into smelly gases by the internal bacteria population and the bathroom disaster is ready to happen.