Rat have different coat colors http://www.afrma.org/fancyrm.htm just like with snakes those paint job are genetic so it all depends on the breeding stocks the breeder has.
For example I produce Albino, self beige, self agouti, self black , beige hooded, black hooded, agouti hooded, and many comes in dumbo version as well.
In other words a rat is a rat is a rat regardless of the color.
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