it sounds like you’re really just trying to overlay one taxon on top of another, using a distinct set of markers for each, right?
there’s an “experimental compare tool” that will allow you to do something like that. for example:
you can also use the taxon map, specifying multiple taxa, although i don’t think you can filter for place or project at the same time. for example:
you can also make your own custom maps. to me, this describes the fastest way to do something like that: https://forum.inaturalist.org/t/in-pursuit-of-mappiness-part-1/21864.