2A Reconciliation

sumanth (Student CA IPC / IPCC) (60 Points)

01 October 2020  
I have not done 2A Reconciliation since Oct,2019
now I'm doing reconciliation for 0ct,2019 to Aug, 2020

now my question is where to show the differences what I have found in 2A reconciliation

I mean in GSTR 3B of September, 2020 return
or
GSTR 9 for the FY 2018-19 ???