JSFiddle - React, Tailwind, and code Playground

HTML

<select multiple>
    <option value="1">Option 1</option>
    <option value="2">Option 2</option>
    <option value="3">Option 3</option>
    <option value="4">Option 4</option>
</select>

<select multiple>
    <option value="1">Option 1</option>
    <option value="2">Option 2</option>
    <option value="3">Option 3</option>
    <option value="4">Option 4</option>
</select>

<button> random </button>

JavaScript

$(function(){
  $(document.body).delegate(
    'select:first', 'change', function(){
      $('select:not(:first)').val(
        $(this).val()
      )
    }
  )
  .delegate(
    'button', 'click', function(){
     $('select').val([1,2,3,4].filter(function(){return!!Math.round(Math.random() * 1)}))
    }
  )
});