When working with different lines of the same morph such as pastels for example, it comes down to variants of the offspring. A sterling made from bell line pastel or a sterling made from a lemon may look different be would be variants of the same morph therefore it have to be named as such. If a cinnamon and a black both came from the same wild caught animal then it would be that way throughout the breedings and its not. Both different morphs. Now blacks i think have more variants then cinnies. The blackest super forms of the black pastel comes from outbacks line imo. Those things are jet black