minimum number of moves to match the arrays arr1 and arr2 in javascript nodejs

var arr1 = [1234,4321];

var arr2 = [2345, 3214];

var sum = 0;

var n = arr1.length; 

for(let i =0; i < n; i++){

  let x = arr1[i].toString().split("");

  let y = arr2[i].toString().split("");

  for(let j =0; j < x.length; j++){

    sum += Math.abs(x[j]-y[j]);  

  }

}

console.log("sum: ", sum);