public IEnumerable <RowLoadResult> GetRowsMissingFrom(TableLoadResult other) => Rows.Where(_ => other.GetRowWithMatchingIdentifier(_) == null);
public IEnumerable <RowLoadResult> GetRowsWhereFieldsDifferFromMatchIn(TableLoadResult other) => Rows.Where(_ => other.Rows.Any(row => row.HasSameIdentifier(_) && row.HasDifferentFieldValues(_)));