Just about everything except truly basement-tier China tech sitting in warehouses has C now so you'll soon be glad to have the ports.
USB C is a form factor (pretty little reversible oval cable). Thunderbolt is a protocol and yes it uses USB C for the form factor. Other protocols on USB C cabling include 2.0 (ancient speed, used for charging only these days), 3.1 (old speed) 3.2 (slightly old but also not, it's weird, and most common nowadays), DisplayPort (lovely modern video standard), and USB4 (which is newest and fast, but not quite as fast as TB). Decent rule of thumb is USB4 will always be one step behind Thunderbolt in speed (currently ~80gbps vs 40gbps in USB4). The cable will work at the fastest speed permitted by both devices. If they both have TB, then TB speed and power. If only one is TB, it'll go at USB speed over yes the same cable because...
Lastly, any proper spec cable will negotiate the best, safest power transfer between chargers and devices. So just don't buy complete junk, read a couple reviews, you'll almost certainly be fine.