ODS 1 is (full) loaded from a flat file and it sends a delta to ODS2.
If only data values are changed in ODS 1 through a repeat load without dropping earlier one (key values are not changed), will there be a delta to ODS2.
If there's a change in the Key section of the record, then this is not a delta, it's a new record, with different key. The new record will be pushed to the next ODS.
If the data change in the data fields of an existing key combination, then it will be a delta and will loaded to the next ODS as such.