Starting with iOS 13.1 and iPhone 11 models (the 11, Pro, and Pro Max), your phone will show a message if it has had a screen replacement: “Unable to verify this iPhone has a genuine Apple display.” It starts as a message on your lock screen, lasting for four days. After that, the warning lodges itself in the Settings for 15 days, and then in Settings > General > About after that. It does not affect your ability to use your device.
This warning, similar to the recent addition of battery warnings, happens even if you swap a genuine Apple screen from one phone to another. To avoid the warning, you have to have a genuine Apple display installed by Apple themselves.
The TrueTone functionality will stay on the iPhone as we use a special programmer to transfer the data across.