XF 1.5 Meaning of "no existing data"


Well-known member
Just to be 100% sure:
After selecting the system to import from, you have the option of retaining the existing IDs for imported users, forums, threads, etc. This is only possible when importing into a new installation with no existing data.
This means only content right? So I can change preferences, styles, install/configure add-ons etc before import?