Resemblance?

So here are Gus and Lucy. Can you tell who's who?

They remind me of one another. Very similar babies in many ways, and yet different. Lucy is more petite and easy going. She is a bit more agile and physically ahead (but Gus was much bigger). Gus is blonder, Lucy darker. They have very similar smiles and giggles and are equally love-able. My kids= my favorite subject.