The only difference between the iPhone 11 Pro and the iPhone 11 Pro Max is the screen size and battery, as well as a version identification resistor.
This was discovered by Youtuber AoMuTech PO when checking both devices. He found that simply removing a resistor from the motherboard of the iPhone 11 Pro can drive the hardware of the iPhone 11 Pro Max, thus making the hardware hacker It’s easy to convert the iPhone 11 Pro to the iPhone 11 Pro Max.
Since the motherboard is the same, this is obviously already possible on the iPhone 6s and 6s Plus, but it is not possible in the later iPhone models.