how to match details for gstr 9

Any differences in details pertaining to FY 17-18, cannot be adjusted now as the last date for adjustments is due date for furnishing of Mar'19. Hence, though return is not filed, it cannot be adjusted as last date is completed. The differences can be highlighted in GSTR 9C and reasons can be given..

The differences for FY 18-19 can be adjusted even in the return of Apr'19.