twins, 7 years apart

When Addie was born we combed through all the baby books trying to decide who she looked most like. I am not sure we ever came up with a definite answer and then someone from church handed me this (top) picture of Addie. It was the weirdest sensation, like looking at two of my children at the same time! When I got home I went straight for Micah's baby book and look...
Couldn't they be twins?