function equalArrays(arr1, arr2) {
  let sum = 0;
  for (let i = 0; i < arr1.length; i++) {
    if (arr1[i] !== arr2[i]) {
      console.log(`Arrays are not identical. Found difference at ${i} index`);
      return;
    }

      sum += Number(arr1[i]);
  }

  console.log(`Arrays are identical. Sum: ${sum}`);
}

equalArrays(['10', '20', '30'], ['10', '20', '30']);