Those who are familiar with GBIF could check an experimental feature which highlights possible duplicate and/or related occurrences.
At the moment, 174,688 iNat observations are clustered with other GBIF-mediated records. That’s really awesome to see herbarium vouchers for the iNat records automatically and unmistakenly selected by GBIF.
A link to clustered data: https://www.gbif.org/occurrence/gallery?dataset_key=50c9509d-22c7-4a22-a47d-8c48425ef4a7&advanced=1&is_in_cluster=true
An example of a simple cluster (photo + specimen): https://www.gbif.org/occurrence/1993715071/cluster