JSFiddle - React, Tailwind, and code Playground

HTML

<select id="mg_sport_game_id1">
  <option value="">Select</option>
  <option value="25">Titans</option>
  <option value="35">Batman</option>
</select>
<select id="schedule_winner">
  <option value="">Select</option>
</select>

JavaScript

$('#mg_sport_game_id1').on('change', function() {

  var val = $(this).val(),
    text = $(this).find("option:selected").text();

  $('#schedule_winner').append(new Option(text, val));

});