They're very similar, but there are differences. Most notably, Thunderbolt 4 guarantees a minimum speed[0] for compliance, whereas USB4 has a lower minimum. A

They're very similar, but there are differences. Most notably, Thunderbolt 4 guarantees a minimum speed[0] for compliance, whereas USB4 has a lower minimum. Also, I believe USB4 was designed for smaller files / blocks and Thunderbolt is designed for more raw output. [0] https://liliputing.com/2020/11/differences-between-thunderbolt-4-usb-4-thunderbolt-3-and-usb-3.html https://liliputing.com/2020/11/differences-between-thunderbo...