I think that'll work out just fine. The line between a butter and lesser is hazy at best. When I'm looking through pictures it seems that the animals that are more yellow and faded are called butters and the ones with more silver and purple/more contrasted pattern are lessers.
EDIT: I guess I should say that the main difference is the wild caught origin. The original butter probably looked different from the original lessers. Selective breeding and similar traits probably made them into most of the examples you see today