There is no difference in essence, but the voltage and current are not the same, 67w voltage or current is higher, the charging power is also larger, and the charging is naturally faster than 30w.
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The difference is that 30W fast charge can only be the maximum power of 30 watts, and 67 watts, the maximum power is 67 watts, charging speed is faster than him, but to the later stage. The speed is about the same.
The above answers hope to help a lot of friends.
The difference is that the charging speed is not the same, fast charging and flash charging is actually the same meaning, the same mobile phone that supports fast charging 67 watts is much faster than 30 watts of charging!