Except for the double form of Nick's Cora Louise, they all look rather similar. I remember buying the Cora Louise from Lowes as a root so I don't think mine is TC. Also, the plant does not have a concentration of eyes in the center as my Lollipop plant from Michigan Bulb. But who knows if the company that sold Lowes the Cora Louise plants started with TC plants or field grown plants. So mine could have been divisions of a TC plant.
I guess I will never know. Whether my Cora Louise is a derived TC plant or not, it is a very nicely grown bush with pretty flowers. In fact, I think everyone's CL is very special and pretty in spite of the variations. Though I am curious as to what the "original" looks like.