After seeing the raw and reading ch 6, I think this are the same game.The chapter is a bit confusing there but I think they're showing 2 different games, Hinami's game (which was the one that had 5 seconds left) and Himuro's game (which had 10 minutes left). You can kinda tell because Chiaki says that he will speak with Hinami while the other game is still going on. I'm guessing they played against each other in the finals or something.
When MC grabbed a drink and met Himuro, on pg 24, she said it will be hard to win. Then MC said "really? You can still catch up".
And well, while not explicit, ch 5 already shows Hinami vs Himuro.
So, I think the 5 seconds left is for first half of the game. Then the 10 mins is for the second half, which takes place after a break. And the score after first half is 21 vs 28.
I mean, it doesn't make sense to insert some random game here.
Also as matlai17 said, those kanji is for group/class. https://jisho.org/search/組
That means all our casts are freshmen/first years.
As seen in ch 2, MC and Chiaki are year 1 class 1.
Hinami is year 1 class 2.
Himuro is year 1 class 3.
So, when the people argued which class to win, they only said.
"well I guess this is class 2's win"
"nah, there's still Himuro's three pointers, so class 3 still have a chance"
I wonder if it is a mistranslation. The term used on the scoreboard and in what they are saying is 3組 and 2組 which, as far as I can tell, just means "group" so 3rd and 2nd group/team is what I am guessing.