Why don't you find out for yourself? You'll need to be scientific here, measure the water to go into each of your two ice cube tray spaces so that they are the same. While waiting for the water to freeze, place some water in a container like a margarine tub and set it aside to reach room temperature. When the ice cubes are ready, put one in the room-temp container and the other in an empty container along side it. Come back often to see what happens!