const arrSame = ['va5ya', '5avya', '5ayva'];
const arrDiff = ['cat', 'act', 'car'];

const isUniqChars = (arr) => {

  const sortFn = (a, b) => {
    if (a > b) return 1;
    if (b > a) return -1;
  
    return 0;
  };

  const getUniqVal = (value, index, self) => {
    return self.indexOf(value) === index;
  };

  const sorted =  arr.map(item => item.split('').sort(sortFn).join(''));

  return (sorted.filter(getUniqVal)).length <= 1;
};

console.log(isUniqChars(arrSame)); // true
console.log(isUniqChars(arrDiff)); // false