A2251 refers to a MacBook Pro (13-inch, 2020, Four Thunderbolt 3 ports), and A1708 refers to either the MacBook Pro (13-inch, 2016, Two Thunderbolt 3 Ports) or the MacBook Pro (13-inch, 2017, Two Thunderbolt 3 Ports). The display from the 2020 MBP is not fully compatible with the 2016 and 2017 models. Although the display portion will function, the camera will not. In order to have a working camera you will need to install a fully compatible display. Check [link|https://logi.wiki/index.php/MacBook_LCD_Screen_Compatibility#MacBook_Pro_Retina|this page|new_window=true] for further information.