I'm trying to think of a good gesture for showing my kindergarteners ALIKE and DIFFERENT

Let me tell you what I do with first grade they are not too far removed from Kinder. We hold up the palm of our hand in front of us (looking into a mirror) for alike, and then we just quickly turn the palm around as if the mirror faced our neighbor and say different.

One way they would look just like themselves, the other they would not. It's simple fast and works. You can even have them move the arm and palm more toward their neighbor (no touching though
Annette