[/nq] Can you give some context as both sentences are open to various interpretations according to context. Without context I would say that the first sentence is something that might be said with relief when people are leaving work at the end of the day (here "done" functions as an adjective). The other just indicates that at some earlier point a certain amount of work was completed and we can see the results now (here "done" is a past participle in a passive structure).
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