Hey Nicole, butter and caramel are the same mutation, except butter has all of the melanin washed off. So extra yellow on both, but no black over top on the butter. I would suggest checking out Ian's Viv
here to see pictures of all of the options. Some lines are way more yellow than others also, so definitely look at pictures of the parents if you can. You might also want to check out saffron, lemon, and honey, which are the sunkissed versions of caramel, amber, and butter. Sunkissed tends to brighten the colors too.