You can use a Thunderbolt 3 cable with a non-Thunderbolt 3 USB-C device, and it should correctly carry power and no more than the maximum either side can handle.
Thunderbolt and USB-C cables and ports are not the same, but they look almost identical and perform nearly the same functions. On most devices, the cables and ports are compatible so you can connect either cable to either port. But Thunderbolt connectors transfer data much faster than USB-C. If you’re connecting a USB-C cable to a Thunderbolt
Thunderbolt 3 devices can use any USB-C cable. Belkin. But USB-C cables vary. Thunderbolt 3 can transfer data up to 40 Gbps – you can get this speed with official Thunderbolt 3 cables or a good Rv1zm.