For Preston, the importance goes beyond the table.
In this division, slow starts can become a talking point fast. A result like this appears to offer Preston a platform rather than just a one-off lift.
The report says Lang struck twice, and that matters because decisive attackers often shape the early weeks of a Championship campaign.
Championship seasons are long, physical and often erratic. Teams that find a reliable finisher early usually give themselves a better chance of riding out the rough patches.
For Blackburn, a narrow derby defeat would sting because these games are often settled by small moments.
The next fixture now becomes important for both clubs. Preston will hope this is the start of a steadier run, while Blackburn need a quick response before one frustrating afternoon begins to linger.