Annual return- sales diff between gstr1 and 3b

1) There is sales difference between GDTR-1 AND GSTR3B. Sales short declared in GSTR3B. How to show the same in annual return?

2) Input available in gstr 2A, but not availed in monthly returns. This input also not availed in subsequent year monthly returns. Is it possible to avail the same now in annual returns?

Any expert please reply, thanks in advance.