Huawei note 30p can use millet black tea 66M, that fast charge can not be, because millet Huawei belongs to two brands of mobile phones, so their charger is not universal, this can be clear.
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66w fast charge can charge mate30p.
Huawei mate30p can use 66W fast charge, but the maximum can only reach 40W, because the 66W fast charge package is compatible with 40W, and the mate30Pro phone only supports 40W and below charging.
Yes, 66w charger is backward compatible fast charge, such as your mate30p maximum support 40w fast charge, then the highest charging power with 66w charger is 40w, not much difference.
66w fast charge can be charged mate 30p mobile phone, in the mobile phone charging because mate 30p does not support a maximum of 66 watts of charging, so can only be charged at a charging speed of about 30 watts, but it can still be used