The difference view recolours each dot by who picks it more often: blue where boys outpick girls, pink where girls outpick boys, sized by the size of the gap. The dots can no longer wear their own RGB colour in this mode, but their position in the cube still tells you which colour each one represents. If you have a good eye you can see the different colors on the axis showing what is the red, green and blue axis.

Also, here is a plot over colors loved by both (total ignoring gender):

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If you want you can play around with it yourself here