A Flan is an open-topped savory pie, the term is rarely used nowadays but 20 years ago Quiches were known as "Egg Flans" in the UK.
A pumpkin flan is similar to a custard cake wherein its main ingredients are pumpkin, eggs, milk, and sugar. It can be either be baked or steamed.
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Quiche.
Flan is a traditional Hispanic dessert. It is a baked custard like creme caramel, and it often has a layer of caramelized sugar on top.
I'm not entirely positive, but I believe that the only difference is where they're originated from. Hope that helps! =]