USB 4 includes more than Thunderbolt, because Thunderbolt was not compatible with USB, despite using the same connector.

All features of Thunderbolt 3 have been inherited by USB 4, like also all those of USB 3, including the ability of Thunderbolt to emulate Ethernet interfaces when you interconnect 2 computers with a cable through their USB 4 ports, like it was already possible with Thunderbolt ports.