Catherine is 22, bubbly, blonde, free-willed, and most of all, overpoweringly sexual. If time machines were allowed in our game, the obvious choice would be a young Marilyn Monroe. She represents freedom and temptation.
Katherine is 32, pretty but not as sexual as Catherine, tall, long haired, stern and mature. Katherine is the cold shower of reality and responsibility. She also represents the familiar, the long-standing relationship.
Here's a video with a LITTLE bit of them both. http://www.youtube.com/watch?v=G2FjqieajyY
And here's the cover of the next show. We'll leave it to you to decide who suggested who for what role.