“..a boundary object is information, such as specimens, field notes, and maps, used in different ways by different communities. Boundary objects are plastic, interpreted differently across communities but with enough immutable content to maintain integrity” Examples include museum specimens and filed notes.
Interface objects are generative processes, experiments, workshops, and ideas that are co-created, developed through collaborative processes between different communities. Interface objects are also plastic and can be interoperated differently across communities but unlike the boundary object, they are fluid entities which can be modified or adapted by their users. https://is.theorizeit.org/wiki/Boundary_object_theory