JSFiddle - React, Tailwind, and code Playground

HTML

<select id="first">
		<option value="uno">uno</option>
		<option value="dos">dos</option>
		<option value="tres">tres</option>
	</select>

	<select id="second">
		<option value="uno">uno</option>
		<option value="dos">dos</option>
		<option value="tres">tres</option>
	</select>

JavaScript

const first = document.getElementById('first');
const second = document.getElementById('second');

first.addEventListener('change', function(e) {
			second.querySelector('option[value=' + this.value + ']').selected = 'selected'
});