I'm not familiar with those cultivars but the color does change on most Coleus depending on light or sun conditions. If you prefer the lighter colors move them into shade again. The older leaves won't change but new leaves will be lighter. When I bring mine into house for winter the colors of new leaves are softer but still attractive. They return to darker colors next spring when they move outside again.

Growing in the same pot is fine as long as they have adequate root room and water. If they are growing well, no problem. Good luck. josh