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https://www.backyardchickens.com/articles/call-duck-incubation-day-by-day-candleing.77411/ I have found this that might be of more help :)

It will yes. What kind of duck eggs are they?

Yes it is different, sorry my bad for not reading the title correctly :oops:

They usually look a little fuller/darker by day 17 so you could have a quitter there. But if in doubt and it does not smell or it isn’t leaking fluid leave it in there. Good pics here for comparison ~...