Sync Buttons State (App) Simultaneously On Bridge Connected Boards

Board 1(NodeMCU)

BLYNK_WRITE(V3) {
    
  int a = param.asInt();
  bridge1.setAuthToken(auth1);
  if (a == 0) 
  {
    bridge1.virtualWrite(0, LOW);
    } 
    else 
    {
    bridge1.virtualWrite(0, HIGH);
    }
    
      }

Board 2 (Arduino Mega)-

BLYNK_WRITE(V0)
{
 int pinValue = param.asInt(); 
  
  if(pinValue == 1)
  {
    digitalWrite(13, HIGH);
  }
  else
  {
    digitalWrite(13, LOW);
  }

}

****How it will update Arduino button when NodeMcu button pressed and ViceVersa

With a 2 way bridge as per the docs and a bit of coding.