I'd worry less about what line it is, and more about how it looks. There are amazing examples of every line, and terrible examples of every line. Best bet is to look at the intensity and brightness of the yellows, how faded pattern is, pictures of parents, etc.
For example, here's my adult breeder pastel. She is not from a specific line. I picked her out based solely on how she looked. As you can see she is super bright and so far is showing no signs of browning out at all.
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