Direct Load Import: A new version of A1(V2), A3(V2), B2(V2), B3(V2) will be created. For A2(V1) and B1(V1), a new version will not be created, since data is not changed.
Database Loader: New versions will be created for all records. A1(V2), A2(V2), A3(V2), B1(V2), B2(V2), B3(V2).