Separated at birth?

In the last week I’ve watched both Casablanca and Star Wars (the original one — I can’t stand to call it “Episode IV” or “A New Hope”). And all of a sudden it occurred to me that Han Solo is Rick Blaine: the cynical mercenary who turns out to be a big softie. It’s so obvious I can’t believe I never thought of it before. Did everyone else already know this? If so, why didn’t anyone tell me?