They seem to have the same abilities. I am an old school Jira user. I would never consider a person with the ability to configure the heart of Jira to be a 'user' - they would be an admin. ANd there are still product admins - so what value does the trusted user title even bring, beyond adding a layer of difficulty for people trying to get certified?
Thanks for reaching out to Community!
The only difference between a Jira administrator and a Trusted user is that the trusted user can invite users.
Both will have access to Cog icon > System, Products, Projects, Issues, Apps.
The difference in the UI for the Trusted user is that when they click on "Switch to" they will see the option "Administration".
Jira administrators: can manage Jira settings.
Trusted users: can manage Jira settings + Invite users.