Mismatch in GSTR1 and GSTR 3B

Amit Kumar (i want to improve my taxation.)   (136 Points)

13 May 2021  
in March month, in GSTR1, we filled correct tournover.
but in 3B we filled less tournover,

should we need files DRC- 03
or
need to filed correct tournover+ April month tournover in GSTR-3B in next year April month