JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-2.2.4.min.js"></script>
<select id='s1'>
  <option>Selecione</option>
  <option value="1">1</option>
  <option value="2">2</option>
  <option value="3">3</option>
</select>

<select id='s2'>
  <option>Selecione</option>
  <option value="1">1</option>
  <option value="2">2</option>
  <option value="3">3</option>
</select>

JavaScript

$("select").change(function() {
   var id=  $(this).attr('id');
   var valor=$(this).val();
   var selects = $('select').not('#' + id).find('option[value="' + valor + '"]:selected');
   if (selects.length > 0) {
      console.log('achei');
   }
});