Bulbs: Is this a natural variation on the comon Galanthus nivalis ?, 1 by bonitin

bonitin wrote:
My first snowdrops are blooming! Normally they only start blooming around the middle of February in my garden, I mean the Galanthus nivalis (Elwesii blooms around 2 weeks earlier).
The picture shows a snowdrop I bought as the common Galanthus nivalis, but the green patterns on the in-and outside of the inner petals don't correspond with the usual nivalis.
Someone knows if this is a natural variation or another variety ?