We incorporate stat corrections up to 30 days after the fact, so H2H scoring can change after the fact. This does not affect results, so teams can look like they win despite scoring fewer points.
The rules have a line about this:
III. e. MLB stat corrections will be applied as necessary and in as timely a fashion as possible. Stat corrections will affect team stat and point totals, but will not change H2H results after the fact
I guess that is just repeating what I just said 
Hope that helps!