The screen's paired Face ID sensor assembly must be carried over. Separate battery and USB-C guides help distinguish a worn cell from a damaged charging port.
What to check before buying
Display and authentication
The iFixit screen guide says the attached sensor assembly is paired with Face ID and must transfer to a new screen to preserve authentication. A used tablet with prior screen work should have Face ID tested.
Battery and charging
Separate guides cover the battery and USB-C port. The battery guide discusses Wi-Fi and cellular layouts, while the port guide says the screen need not be completely removed for that procedure.