I'm not familiar with Flower Horns, but if you type in difference between the two in the search bar above, until someone knowledgeable with Flower Horns response. Btw welcome to MFK
Welcome.
The difference between a Kamfa and a King Kamfa is basically the King will have longer trailers on the fins and larger, more prominent pearling. Also a King will, or tends to have, a bigger nuchal hump.
I know a true Golden Monkey/Kamalau can be very expensive, but I don't really know the magma breed. I do know it is more common than a true Kamalau.
I really haven't had many Flowerhorns so I won't comment further.