I keep L.numidica and apart from their country of origin I'm really not sure there any differences. Numidicas come in 2 variants; light stripes and dark stripes, while flammeas come in 3; unicolour, red stripes and brown stripes. The flammea variants seems to be the result of selective breeding, while numidica variants exist in the wild.
Flammea variants are not from selective breeding. All these variants are also in nature and imported. In numidica I keep and saw anly dark and light stripes. Difference is in striping where numidica has on each whorl half stripes slůender and more numbers of them and half are bigger.