You can't tell from looking at them. You would have to ask the breeder, but it doesn't matter anyways. Without everyone selectively breeding each separate line for the same traits, they all start looking the same within a few generations. I have pastels from the Bell, Graziani and VPI lines, and if I had to take a guess I would say that yours comes from the Graziani line based on the color and blushing, but it could just as well be from the blond or VPI line.
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