Yanmar 3gm 30f fuel injector removal and compression testing g questions

[Mg451]

I'm going to be pulling out my injectors to do a compression test. I was wondering g about the copper gaskets precombustion chamber and heat shield. When I do this test I pull out the injector do these parts stay in the head
and just the injector comes out right? Do I need to put a copper gasket in with the injector adapter to do the test? And I need to replace the copper gasket when I return the injector? I attached a pic of just the injector and a pic (23) that shows the gaskets heat shield and prechamber.