JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<select name="group1">
    <option value=""></option>
    <option value="emissao">Data Emissao</option>
    <option value="entrada">Data Entrada</option>
</select>

<select name="group2">
    <option value=""></option>
    <option value="emissao">Data Emissao</option>
    <option value="entrada">Data Entrada</option>
</select>

JavaScript

jQuery('select[name="group2"]').val('emissao');
jQuery('select[name^="group"]').on('change', function() {
    var self = this;
    var selects = jQuery('select[name^="group"]').filter(function() {
        return this.value == self.value;
    });
    console.log(selects.length); // 2 quando os valores forem iguais
});