When trying to compare species either through “Compare” button in Explore mode or through Suggestions tab in Identify mode there are different levels of geometric filtering. The last level is “country”. Unfortunately that is not very good as the coverage of current data is insufficient for uncommon species or less known groups. It is possible to remove the Country filter, but that brings up results for whole world, which is not reasonable in most cases.
Therefore, I would propose adding another filtering level below Country. It could be either “Continent” or some geometric radius from the current coordinates. It may be that the latter is technically difficult, but if it is not, some 1000 … 2000 km radius would likely suffice in most cases. It might even make sense to add both with the radius set at the lower value.