can
Yes, but not as fast as the original.
That's totally okay. Huawei 66W and 40W are Huawei private flash charging protocols SCP. SCP protocols can be negotiated and matched between different power levels.
The above answers hope to help a lot of friends, thank you for your support and encouragement, I will continue to try my best to answer all your questions for you.
Huawei's 66-watt fast charger can charge the Honor 30, with a maximum power of 40 watts when charging.