There are 4 types of dwarfs LP.
There is the Winter White Russian, The Campbell's Russian, The Chinese and the Roborovski and they all look quite different when you get to know them.
The WW and Campbell's can breed together as they are very close genetically but these hybrid animals have many health problems but commercial farms have done it to produce interesting colours and patterns. In the wild this would never happen as they live in different areas.
Look here and you can see all the different types and the colours they come in
Midland Hamster Club