Not by much. 66 watts must be a little faster
In the case of the same brand, it must be 66 watts better, and the actual charging speed of the same brand is not much different, the premise is the same brand
For example, there has been an online evaluation that OPPO's 65W power in 15 minutes is about twice as much as Huawei's 66W. Rice explained that the reason is because Huawei's peak power of 60W lasted only half a minute, and the rest of the time fluctuated between 30-35W
These two fast charges are similar, because the difference is not very big, but the charge is faster.
66w fast charge is faster than 60w fast charge, and 66w is a good point.