When to use a Fret Saw vs Coping Saw?

Hi guys,
Every time I look in the LV catalog, I wonder this, because they sell both. Can you please teach me: when does one use a Coping Saw and when a Fret Saw? I ask, because it seems like folks use them interchangably. Yet they must serve different purposes in some way?

Thanks very much!
Fred

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When to use a Fret Saw vs Coping Saw?