I tend to think most newborns in a family look a lot alike. They look close but I'd prefer to wait until around 6-9 months. Once they hit that age, take a head shot and zoom into one facial feature, like an eye, the nose, the mouth. Can you tell what baby it is by looking at just one feature? If not, then probably ID.
I think identical BUT all tiny ones look alike to me!! One placenta or two? Do they have the same ears?
On most of those pictures I definitely thought they look identical. Then I saw one or two pics that made me think maybe just fraternal with VERY similar features. I think they are probably identical, but would feel more confident in my guess seeing a picture of them when they are older. Either way they are cuties!
I think they look a lot alike too, but I think it's too early to tell. My boys look very different to me, but we had the DNA test done and they are ID. Do you know if they have the same blood type? If not, their pedi may have it on file.