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I've been wondering the same thing. I noticed USB 3.1 Gen 2 cables are thicker, otherwise they're likely to be USBC 2.0. In terms of markings, they're supposed to say SuperSpeed+ (SuperSpeed 10 Gbit/s) with logo but not actually seen this myself. The plug is identical and normally not colour coded.
I've put the 2 side by side are main difference seems to be the thickness of the cable.
Thunderbolt 3 also has the same connection. One would hope those are labelled with a lightning bolt to differentiate.
I know. They've not made it easy at all and good luck getting manufacturers to label them properly, if at all.
Supposedly, USB C is all supposed to be able to carry 3A. They're supposed to be either 3A or 5A but I suspect quality varies. Some are limited to 2.4A. I'd say go with the thicker, better quality looking ones for devices that need a bit more power.
Can't go wrong if you used a Thunderbolt 3 cable probably. If you have some which don't work with those devices, they're probably the lower spec'ed ones. Notice the thickness of the cable.
Oh and cable length matters too. Max 2M. Shorter the better I think.