exists vs in. just checking my understanding

select *
from employees
where emp_no in(select emp_no
from titles
where title = 'Assistant Engineer');
I used this query and got the same no of rows returned. 
Assuming that this is indeed correct, we need to use e.title = t.title in case of exists because exists does not return any value but simply checks if the statement is true and in case of in, even if we just check for the given job title, as it is returning all the emp_no for which the title is Assistant Engineer we dont need to check for this condition.

Did I understand this correctly?