The iPhone 11 Pro has 800 nits of brightness, while the iPhone XS Max tops out at 625 nits. There are also differences in the display itself: ***The iPhone 11 Pro Max has a "Super Retina XDR" display, while the iPhone XS Max has a "Super Retina HD" display***.
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All in all, the displays are different, and likely won't fit the connectors.
The iPhone 11 Pro is slightly brighter.[br]
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The iPhone 11 Pro has 800 nits of brightness, while the iPhone XS Max tops out at 625 nits. There are also differences in the display itself: ***The iPhone 11 Pro Max has a "Super Retina XDR" display, while the iPhone XS Max has a "Super Retina HD" display***.