Similar features on other platforms include sharing checklists on eBird or tagging other users in posts on facebook or instagram. On eBird when you share a checklist, for the most part it simply duplicates it for the other user. Credit for the species and comments is duplicated to the other person as well. Only photographs and audio stay credited to the original poster. Both checklists show up as duplicates when you search for observations of a species but presumably there are ways of filtering out shared checklists if you’re working with data behind the scenes. I think following this model would work.
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