You can facilitate the sharing process if you link source and destination Moodle courses via a Moodle course that is itself shared between the teachers (= all teachers can backup from or restore/import into this shared course), but not to students.
By backing up to and restoring from such a shared Moodle course, you can more easily inspect the shared course content than
if you’d import into the destination course to inspect,
or either inspect the unzipped XML of the Moodle course backed-up content format, like here:
which can be a daunting perspective on your content:
A little more instructive are the Moodle course export file columns in a handy list, with sample content (where available in our case – sample content does not represent an actual “row”, but merges multiple “rows”, using Excel’s “Paste Special’/ “Skip blanks”):
As you can see, there are fewer than 254 column (meaning you can even load this into Excel <2007), and apparently you get to actual teaching content already on nesting level 3.