I am not as familiar with ducks as chickens but my best guess is that the paler one with the light colored breast is a blue Swedish and the dark one is a Cayuga.
The lighter one looks like a khaki campbell to me.. the darker one could be a dark campbell.. those i'm still pretty new to ducks myself so I wouldn't count on me for advice.
It's hard to tell will the shadows, but I agree that the one in front looks like it might be a swedish. It's not a khaki with the yellow patch on it's chest. The one in back looks like a cayuga in this lighting.
Since everyone’s consensus is Blue Swedish and Cayuga I thought I would provide you with pictures of my Blue and Cayuga for comparison. They do look similar to mine but as mentioned before, a better picture would be easier to confirm.