Yes, Huawei 40W charger is also compatible with 5V2A output, can be used with the charger temporarily, long-term use is best to use 10W ordinary charger, only temporary use, long-term use may damage the phone.
Huawei gt3 supports wired fast charge and wireless charging functions, in addition to charging with a special wireless charger, but also can use Huawei mobile phone to reverse wireless charging of the gt3 watch, Huawei gt3 battery capacity of 42mm version 292mAh, 46mm version 455mAh.
Huawei Watch GT 3 does not support 120W charging. According to Huawei's official specifications, the Watch GT 3 supports wireless charging of up to 10W and wired charging of up to 5V\/2A. Therefore, using a 120W charger to charge the Watch GT 3 is not suitable and may cause damage to the watch. It is recommended that you use a charger that meets the specifications of the watch to charge it to ensure a safe and normal charging effect.
No, Huawei watch design specifications are 5V, 60W charging limit, 120W is already twice its, even if the actual power can exceed 60W, but there will be explosion risk, or do not try