There is a certain difference.
The fast charge agreement of Xiaomi and Huawei is completely different, and the fast charge of Xiaomi's mobile phone does not support Huawei's fast charge of more than 40W. Because Huawei is only open to the outside world to 22.5w. In response to your problem, if it is only 18W Huawei fast charge, the Xiaomi charger that generally supports the PD protocol can also charge Huawei mobile phones, which can reach 18w, and the actual experience of charging speed is still relatively slow.