Different Media Access Control and framing. They're only borderline related, even in terms of radio channel definitions (they overlap in the 2.4GHz frequency range, but are incompatible).

Your microwave oven is around the same spectrum(2.45GHz). Doesn't mean that it will be able to transmit WiFi or Bluetooth, but it might interfere with both.

Technically, if it is just "a fancy SDR" and not some hardware dedicated just for WiFi