New Layer: Duck Egg Size Question

[EggMan207]

I have several young hens and two young ducks all in one coop. The ducks are at laying age, and the hens are at 12 weeks (there are 2 leghorns). It looks like I've started getting eggs from the Khaki Campbell, but the eggs are the same size as a chicken egg. So, I'm not sure... The shells are smoother and a slightly dirty white color. The shells are slightly harder to crack too. I'm thrown off by the size. I thought they were suppose to be bigger. Will they get bigger in time similar to chicken eggs? Please help.

 

[sourland]

They will become larger as the ducks get further into their laying cycle.