[voraa]

Нет уверенности, что точно понял правила, но может так сойдет

const arr1 = [1.58, 0.12, 0.1, 0.06, 0.06, 0.06, 0.05, 0.05, 0.05, 0.05, 0.05,0.01];
const arr2 = [1.58, 0.1, 0.06, 0.06, 0.05, 0.05, 0.05, 0.05,0.01];
const findMatch = function(arr2_Iter, arr1_Iter) {
    let ary = [];
    let arr2_Copy = arr2_Iter.slice(0)
    for(let i = 0;i < arr1_Iter.length; i++){
        for(let j = 0; j < arr2_Copy.length; j++){
            if(arr1_Iter[i] == arr2_Copy[j]){
				arr2_Copy[j] = NaN;
                ary.push(i);
                break;
            }
        }
1    }
    return ary;
}
  
const indexiReal = findMatch(arr2, arr1)
console.log(indexiReal);