The smaller one might "purple up" after a while, Dylan. Sometimes newer growth comes out greener, and the purple color comes in later. Or if it does have less of a root system it's maybe not getting as much nutrient uptake as the big one. It looks healthy, and they really are tough plants so I wouldn't worry.
Could there be a difference in the soil you planted them in? Or somebody emptied that wine bottle over the purple one ?? (just kidding)
