Because Bamboo Rats are farmed for food they have had a lot of mutations created in the process. The two photos are probably the same species, but with a white individual you can't really tell from a photo because the distinguishing features (i.e. colour and pattern) are not present.
sinensis, pruinosus, and sumatrensis are all used in farm-breeding.The only bamboo rat species that was farmed for food was the Chinese bamboo rat (Rhizomys sinensis).
sinensis, pruinosus, and sumatrensis are all used in farm-breeding.