Personally, I believe it would be very difficult to develop a foolproof method. There will be infinite ways for the author to submit the same submission more than once to multiple tracks, sessions, or sections (OJS). Checking just for the title may not be enough.
Also, having specific a submission checklist item detailing that the submission must be sent to the most appropriate track and that repeated submissions will be either ignored or archived/excluded permanently by the editorial team seems to me a better approach.
It is easier to rely on the Director(OCS)/Editor(OJS) to check for repeated submissions, as they have, with current versions, the ability to list submissions by title and author.
Although it may cause some greater work on these roles, it is easier to control if there are no section/track editors assigned, which will force the Director/Editor to check the submission first before assigning anyone to them. It may be their responsibility to define the correct track/section according to the policies and specific needs.
One 'policy' could be to assume the most recent submission as the valid one, for example.