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I've found that if a charger is supplied for USB, that's the one that has to be used, unless the charger has an exact spec and that matches. The USB-C gadgets have all the options that used to be on USB (as some are simply a USB-C socket on micro-USB circuit), plus there are at least 3 different schemes for more than 5V.
It's a mess.
Devices used to have on them at least the current when all were 5V*. Recent USB-C devices I've got don't list the standard used, or current or voltage, anywhere.
[* Though it might have only taken 500mA if the device and charger didn't have the same spec. Apple was different on USB-A end.]
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