What’s the difference between prequalified and pre-approved?

Fwd: @zillow: Q: What is the difference between pre-qualification and pre-approval? A: https://t.co/j7x94S3g32/s/BHBt https://t.co/2RGyeecTXQ/s/Seej CB#: 6083341449
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What’s the difference between prequalified and pre-approved?