Chosen Solution
Series 4 lcd and digitizer damaged, Found a working lcd/digitizer. I would like to simply swap cracked screen for good working screen but it is difficult to get the screen off working unit even after heating up and tried to stick plenty of tools in between screen and case of the watch.
While not quite the same it follows the same design, Review this guide Apple Watch Series 3 Screen Replacement You’ll need a new full display assembly, you’ll also want to carefully remove from your old watch’s display the NFC module so you can transplant it to the new display assembly if you want NFC to work. To be clear you can’t transplant the display over to the other crystal. I know people have tried, all they get is a messed display, parts working other areas not. Spend the money getting a good assembly and don’t go cheap!