As I'm unsure of your OEM system's setup, I can only give probable answers.
Case fan: More likely than not. Take the connector off the old motherboard or braching of the power supply, and simply hook it up onto either one of your new motherboard's fan headers or a branch of the power supply.
Power supply fan: What a hassle to disassemble the thing and switch it! Power supplies come with fans right from the store.
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