USB-C tells you the shape and hardware capabilities of the cable connector; USB 3 tells you the data transfer protocol and speeds of the cable.
USB-A vs. USB-B vs. USB-C: What Are the Differences?
USB and USB-C here are the differences
Thunderbolt 3 vs USB C: Understanding the Difference and What it Means
Actual Speed Difference between USB 3 VS. USB C
USB-A vs. USB-C: What's the Difference? + What's Best for You?
What's the Difference Between USB 3.1 Gen 1, Gen 2 and USB 3.2? - Kingston Technology
Thunderbolt 3 / 4 vs USB-C: What is the Difference? – Ascrono
What Is USB Type-C? Specifications, Data Transfer Speeds Explained, Compared
USB Type-C vs Lightning
USB-C, USB-B, and USB-A: What's the Difference? - ViewSonic Library
USB-C vs. USB 3: What's the Difference?