Summary
It is possible to swap a Dell Optiplex 3020 SFF case with a Dell MT case, as the MT case has the same 5 pin power switch cable as the SFF case.
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Additionally, the MT case includes a Dell proprietary 5 pin 4 wire fan, and the 3020 MT CPU heatsink is mounted to tapped struts of the SFF case without a backplate.
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If the motherboard is fried, users can find a used or re-manufactured motherboard on eBay, or they can buy a XPS 8500 motherboard which is easier to install in a new (m)ATX case.
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When booting the new replacement motherboard, users should boot with their old CPU and re-enter their Microsoft OS license again.
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