I believe they are the same mutation, just selectively bred a bit differently. They do the same thing when it comes to being crossed with another lesser/butter and when mixed with a pied they usually make an all white pied. I know I shouldn't bring mojaves into this because it's already a bit complicated as it is, but mojaves do seem a bit different when it comes to when they're mixed with a pied, they usually have markings, and when mixed with another mojave the blue eyed lucy they produce is usually darker. However, you could consider them the same morph because they produce a blue eyed lucy, just a bit different.