A given USB Type C cable can be a "USB 2.0" cable, which is only good for USB @ 480 Mbps and power, or a "USB 3.1" cable, which can handle USB @ 10 Gbps and power, as well as alternate data modes like DisplayPort or Thunderbolt. Additionally, it can be only good for 3 A, or it can have a chip in it to indicate it's good for more power (up to 5A).
The Apple-supplied cable is probably a USB 2.0 cable, with a chip indicating it can handle 5A.
The Apple-supplied cable is probably a USB 2.0 cable, with a chip indicating it can handle 5A.