Yes sure, just make sure you point to iTunes media folder rather than the original folder they were added from if you have iTunes configured to make copies of songs added to iTunes (which is its default)
i dont let itunes manage my folders.
i created the whole library with the add to itunes checkbox in songkong and i am pretty sure it missed a few files to add correct into itunes. so i wanna rescan the already added files too and maybee put in some changes in folder naming too.
just to be sure= i point songkong to the folder where all my tagged and "itunes added" files are. then leave the "save to itunes" option checked and it just updates or added new songs instead of making duplicates?
so i assume i leave the move to folder option unchecked this time?