Yep, they get stuck in there good. Oil leaking around the injector threads will do it, as will escaping combustion gasses. Either way you get carbon buildup that seizes the injector(s) in place.
Turbo injectors "pop" at a higher pressure than NA injectors. The higher the pop pressure the more time they will take to pop, and the more advanced the pump needs to be to compensate. If you put turbo injectors on an NA and try and use the NA timing spec it won't be right, likewise if you go the other way.