The templates determine whether new schemes are used or existing ones chosen, and the last option on the list is set up to simply take the standard lot.
After clicking the Add Project button the Select Project Type dialog appears and presents six types.
If you chose the last one, JIRA Classic, when the project is created it uses the already-existing default schemes. If, on the other hand, you select on of the other types, new schemes are created.
The new schemes are based on the defaults, are essentially copies of them. But they are new, separate schemes.