Hi
There are masses of coins, like https://en.numista.com/catalogue/pieces5987.html, which have approved differences between some mintages, like "light" and "dark" iron for mintage 1942, but no clear picture is added/available to better understand the difference.
I would propose to set up a special task page (within "Catalog" drop down menu), where open-public tasks could be visible to all users, who own both (or more of) such coin types.
"Somehow" every user could propose (with referees approval) or referee could set up a public task, which would emerge on such special page, where every user who owns both types could see the list of these tasks and therefore add pictures of both types in comments section for better understanding what actually is the difference between two mintages => eg. what actually is "light" and "dark" iron, other coins have other differences.
Currently, such requests are done by referees to those users who own both types manually (so it seems).
LP