Well, I'm not 100% on the differences, This is from u-look-like-a-hamster's hamster caresheet thread "Winter whites are very vocal and make the same noises as mentiond above, just more often, Females are more socialble, anddont tend to squeal at you, whereas males, wil get stressed if you try to hold them, WW come in a fewdifferent colours ranging from pearl to grey, all having dorsal stripes, pure WW turn white in winter, because of the sunlight hours changing.
Campbells come in more of a variety of colours , like black to beige, being the same main species as WW they look similar, only few hamster owners can tell the difference.
People often mistakenly breed WW & campbles together, resulting in hybrids which is unhealthy for they hamster , but most commonly found, if a male WW is mated witha female campbel, the female will die in birth because the ww babies are too big for them to be pushed out so breeding is never a good idea. Neither breeds do well living together.Both live to about 1 1/2- 2 1/2 years"

Although all hamsters are different, and p@h tend to get the crossbreds campbells x Winter Whites.

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