In terms of the length of the hydrocarbon chains, winter diesel has shorter chains than summer diesel (to reduce the gelling temperature), which moves it toward

In terms of the length of the hydrocarbon chains, winter diesel has shorter chains than summer diesel (to reduce the gelling temperature), which moves it towards a kerosene-like composition. So in that way you could say it's a blend of (summer) diesel and kerosene. However, it's a product made to diesel specifications at a refinery, and has to satisfy all the other properties of diesel fuel standards like sulphur content, cetane number etc etc.