What's Difference Between Apple 20W and Apple 18W Charger

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https://amzn.to/3kVtUFF (Apple 20W)
https://amzn.to/3M3bmiC (Apple 18W)

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Introduction
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Over these years, Apple released 18W and 20W fast chargers for iPhone and iPad.
And the appearance is almost the same.
So, what's the difference between those two chargers except for the 2W.
Today, ChargerLAB is gonna answer it. Let's go.