Yes, as long as your film matches the conditions of each section, you can submit to both.
The same goes if you would like to submit the same short film to La Cinef (student short films) and the SFC.
You can directly submit to both sections when starting the submission process.
If you only submitted to one section, you can submit to another by logging in to your personal account and clicking on ‘SEE MY REGISTRATION’. An option to submit to another section will appear below your initial submission if your film is eligible.