(Same 11-inch version for comparison). The 2021 chip is the M1, and the 2019 chip is the A12Z Bionic chip. The 2021 front-facing camera is 12 megapixels, and the 2019 front-facing camera is 7 megapixels. The 2021 model supports USB-C fast charge, while the 2019 model does not. The shape, size, battery capacity and screen are the same. Recommended 2021,M1 chip processing speed is particularly fast