LOL! Actually in a blog(read it very long ago) i read that fullscreen injected hack uses simple tricks like toggle autoaim, player names & weapons they use, uav on/off like changing the particular value in the offsets. So thought that it's different from external hack. But I have no idea about ESP boxes in injected hack. Private hack uses some complex injection methods to make it undetectable.
I will check them as soon as possible. Since I am little bit busy with work.