Most morphs change quite a bit as they age. Your female has had time to brown up a bit and muss up the cleanness of her pattern.
Also, morphs vary a great deal. Looking at various pastels can show you the wide range of variation on color, cleanness and patterning. So yours could be "just a lesser/butter" or it could be more. I would go by what the breeder sold it as, until proven different.
When you breed it out, you'll find out what genes it carries.
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