I'd guess that the variety 'Kartuz Giant' originated from Kartuz Greenhouses and was either a selected clone or the result of hybridizing the plant. They are still in business. If it's from them, then I'd expect there is a reliable difference in the plant from other cultivars. My other guess is that there is nothing to distinguish between most of the pass along plants which are given names. I'd be curious to know any differences between them. Obviously the variegated one has a visible difference, but I'm guessing if there was a difference in some of them it has been lost in time. I would only put photos of what I'm growing under a generic entry.
