Hi Garion,
For generalizations & specializations, the generalization attribute values are stored in the generalization table and the specialization attribute values stored in the specialization table. Both the generalization and specialization will have the same object ID. The object ID value is dictated by the specialization object.
So to answer your question, they are all the same object, the "location" of the values is just split out over the different tables, depending on which entity contains the attribute.
Hope it helps!