It is pretty much the same with the twins except I also get to compare them side by side and see the differences between the two of them. At the moment Zachary's eyes definitely seem to be lighter and my guess is they will be blue, whereas I reckon Zoey's might be darker.
I know it's most likely down to the Instagram filter I'm using here but in this photo I took today it is starting to look like Zachary might well be my little blue eyed boy.