The 11.3 SP1 and 11.3.6 passwords encryption are compatible.
You cannot see the users imported from 11.3 SP1 because of a difference in the tables content.
The solution will be to run the following query to fix the difference between 11.3 SP1 and 11.3.6 release:
update aedbadmin.ujo_cred set cred_type = 4 ;
After the above queries, you will be able to find back all your users and passwords.
Problem resolved by applying the solution.