Hello,
Here are some examples:
โข Pre-release: CELEBRATION, BANG BANG, Surf, REBEL HEART, ...
โข Title track: BOOMPALA, BLACKHOLE, COLOR, ATTITUDE, ...
As you can see (in the image), pre-releases usually have lower broadcast scores because promotions for pre-releases ended before the physical album was released (or in the case of SURF, it wasn't even promoted on Music Bank because Music Bank was canceled that week). Therefore, title tracks will have higher broadcast scores than pre-releases because that's when they're promoting the title track.
It's always been like that, but in the most recent case of aespa's WDA/Lemonade, WDA (a pre-release) had a higher broadcast score than Lemonade, even though aespa was promoting Lemonade at the time.
That's all I've observed; hopefully it will be helpful to you and your community. If possible, please retweet/repost so more people can see this.
Have a great day!