You should be able to apply to the state board with your IL SE for reciprocity without having to sit the 8-hour exam. I know for certain this was true as of two years ago, but as STR_BR mentioned, it would be wise to confirm with the state board.
I can confirm that it is the same process for the PE as well. I actually took the PE on Friday and SE Lateral on Saturday in October of 2017 and both registration processes were identical - just sign up through NCEES and receive confirmation about two weeks before the exam.
I took the exam once in Illinois and then moved to the west coast and had to take the second portion elsewhere or travel with all of my materials back to Illinois. I did a little bit of research and I found Oregon to be about as easy as it gets. The state board does not get involved until after...