yes, if you’re limited to filtering for a single set of results from the Explore or Identify pages.
however, you could either merge multiple result sets (finding matches on observation id) or do some processing of API results to get your answer. here’s a page that can get you part of the way there by returning observations from the API and optionally also showing you how multiple specified users identified each observation. so if you scan through the results, you’ll be able to tell when all of the specified users made identifications on the observation. ex: https://jumear.github.io/stirfry/iNatAPIv1_observations?ident_user_id=tiwane,kueda&per_page=200&options=idextra&idextra_user_id=tiwane,kueda&taxon_id=48267