https://wccftech.com/iphone-13-pro-and-pro-max-have-absolutely-identical-camera-features-unlike-the-iphone-12-pro-and-pro-max/

In case you are wondering whether there is any difference between the iPhone 13 Pro and iPhone 13 Pro Max camera system, there's not.

Last year, the iPhone 12 Pro Max had a better camera system. It had a wider aperture for superior low light performance and optical image stabilization for perfect shots every single time compared to the iPhone 12 Pro. Needless to say that you were missing out on the camera if you are really into finer details.