Oh, it’s actually not that hard. Now Lemmy explain:
The 3.x are spec revision numbers, it’s the fhe Gen number that indicates the data speed, so USB 3.0/3.1/3.2 Gen 1 are all 5Gbps.
All USB-C cable can do 100W PD regardless of data transfer, EPR labeled ones can do 240W but it’s very recent and not very popular.
You can just look at the number of pins inside the plug to see if the cable only supports USB 2.0, as the 3.0 data pins will be missing and there will only be 14 or 16 pins total instead of the full 24.