Filippo amongst all the different Cattleya purpurata cultivars(varieties), there exist some extremes like var. rubra, var striata, var. concolor, some coeruleas, but in many other cultivars there are only subtle differences like the width of petals, petal width color patterns and some color shades. Some times the clonal names are given when an orchid is awarded. For eg. A Cattleya purpurata var. tipo could be awarded for cultural excellence and then it is a given a cultivar name say XX so the correct name would be C. purpurata var. tipo ''XX''. Like in case of C. purpurata var. rosada ''Dark Hsingying'' BM/TOGA, it was a normal var. rosada but that particular plant was awarded a BM/TOGA (Bronze Medal by the Taiwan Orchid Growers Association) therefore the clone got a specific name Dark Hsingying. Many a times it happens due to miss-labelling that the variety name is replaced by the clonal name and it can cause confusion. It appears to be a similar case with your plant or there could be some very suble differences. If you contact the vendor, may be they will be able to clarify.