It goes H2H, then division record, then record against the rest of the NL, then starts getting weird with "Last half of Interleague games"
Yeah the Padres have 7 more against the Rockies and 3 more against AZ, we have one series each against Pitt, Cincy, and St. Louis. Padres definitely have an easier road, though the Cubs' is hardly scary.
Not impossible the Cubs outplay the Padres in those 10 games, but I would guess if they do they'll have won the #4 seed outright making it moot.