Who has the same job as their initial job - sql

Question

psql (9.6.1, server 9.5.5)
hr=> select employee_id, job_id from employees;
employee_id | job_id
-------------+------------
100 | AD_PRES
101 | AD_VP
102 | AD_VP
103 | IT_PROG
104 | IT_PROG
107 | IT_PROG
124 | ST_MAN
141 | ST_CLERK
142 | ST_CLERK
143 | ST_CLERK
144 | ST_CLERK
149 | SA_MAN
174 | SA_REP
176 | SA_REP
178 | SA_REP
200 | AD_ASST
201 | MK_MAN
202 | MK_REP
205 | AC_MGR
206 | AC_ACCOUNT
(20 rows)
hr=> select employee_id, job_id from job_history;
employee_id | job_id
-------------+------------
102 | IT_PROG
101 | AC_ACCOUNT
101 | AC_MGR
201 | MK_REP
104 | ST_CLERK
124 | ST_CLERK
200 | AD_ASST
176 | SA_REP
176 | SA_MAN
200 | AC_ACCOUNT
(10 rows)
The task is from the student's guide on Oracle Database 10g. I just cloned the schema and data for PostgreSQL.
So, the task is:
Create a report that lists the employee IDs and job IDs of those employees who currently have a job title that is the same as their job title when they were initially hired by the company (that is, they changed jobs but have now gone back to doing their original job).
My solution is:
select
employee_id, job_id from employees
intersect
(select distinct on (employee_id)
employee_id, job_id from job_history
order by employee_id, start_date);
But there are published Practice Solutions for this course. And in it we can find:
SELECT
employee_id,job_id
FROM
employees
INTERSECT
SELECT
employee_id,job_id
FROM
job_history;
But their solution is not about initial hiring. Who is wrong: me or they?