if i’m understanding you correctly, you’re effectively trying to compare 2 sets of data:
- species observed (by anyone) in a particular place A
- species observed by you and another person in place A
if that’s correct, you can’t really do this in the Explore page as one query. however, there are existing tools that may help you get this information relatively easily.
if there are less than 500 species observed in the place in total, you can use the “experimental” compare tool to handle this: https://www.inaturalist.org/observations/compare. (you could also break up the species into subsets by, say, kingdom or family to work around the 500 species limit.)
if you have more than 500 species observed in a place, you can use the “missing species” tool by @kildor (https://kildor.name/inat/missed-species, or see https://forum.inaturalist.org/t/several-external-tools-for-inat-data-by-kildor/19906 for more info), but i believe you’ll need a project that effectively serves as a proxy for the site, since that tool can only compare user(s) to another user or to a project.
there are other ways to get what you’re asking for, of course, but i think the above 2 methods are going to be the fastest way to get the answer without creating something on your own or jumping through many hoops.
have you actually tried this? does it actually produce a result that you expect?
even if there was only one user to account for, would this be the right parameter to use in this case? that parameter seems to operate based on species the user has observed anywhere, even if you limit the core query to a particular place, i believe. so i don’t think that would get: