I keep seeing this statement pop up that lines don't matter when it come to mutations. I have to wholeheartedly disagree. When it comes to pastel line's they most certainly do make a difference. Now there are exceptions to every rule but for the most part what follows holds true.
Line breeding animals for a specific trait is a method breeders use to emphasize a particular attribute they like in a mutation.
For example. These two animals are the same age in these Pics
Graziani Line pastels are bred to highlight the blushing and flames so they look like this as adults.
Where as NERD line Lemons are bred for their intense yellow color and stark black contrast..and do maintain that look even into adulthood like this 2 year old male below
Now this is not to say that you can't find lemons that look like Jungles or Jungles that are as bright as Lemons.
But I can tell you from experience with both line's there is a difference. And breeders that take care to maintain that difference through selective breeding can hold two snake of different lines side by side and they are night and day difference..
Is the Genetics the same..YES!! but the look of the offspring is so different there's no doubt that they are bred for two totally different looking animals.