This is why I use a homemade grid shaker with marbles (check variations threads). No patterns to memorize there. But I would say otherwise, mix the grid cards from both versions, and use the mix for either game. Or just print a few of your own, or color some on grid paper (cover the back though so it doesn't show through). Or just use one of the many codenames apps people have posted and only use the colors on the grid and ignore the words.