RFI is also electromagnetic radiation, usually travels longer distances at high frequencies but is otherwise similar to EMI
Not really. RFI is just a subset of frequencies within general EMI. My favourite AI says:
EMI (Electromagnetic Interference) is the broad, general term for any electrical noise that disrupts a circuit, covering frequencies from 0 Hz up to several GHz (including power lines, motors, etc.). RFI (Radio Frequency Interference) is a specific subset of EMI, referring specifically to interference within the radio frequency spectrum, typically between 10 kHz and 300 GHz

