What type of cable comes with the 16 PM? I would assume that it is a USB and not TB cable?
Those charging cables always are only USB 2.0 with 480 Mbit/s. If I understood correctly the 15 Pro has USB 3.0 with 5 Gbit/s and the 16 Pro USB 3.1 Gen. 2 or 3.2 Gen 2 which both have 10 Gbit/s. So a TB cable wouldn't make any sense and is much too expensive for just charging, what most people do.