Two PDO DB connections for two different MySQL servers in the same script

Until now I used one MySQL server to which I was connection through including the following code from a file like i.e. pdo-config.php

<?php
$host = 'server';
$db   = 'db';
$user = 'user';
$pass = 'pass';
$charset = 'utf8mb4';

$dsn = "mysql:host=$host;dbname=$db;charset=$charset";
$options = [
    PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
    PDO::ATTR_EMULATE_PREPARES   => false,
];
try {
     $pdo = new PDO($dsn, $user, $pass, $options);
} catch (\PDOException $e) {
     throw new \PDOException($e->getMessage(), (int)$e->getCode());
}
?>

I would like to connect to a second MySQL server in the future with the same method and use both connections in the same PHP scripts. In order to not mix up things I was thinking to change the second connection parameters in the way that I would add a "2" at the end of every variable name like following:

<?php
$host2 = 'server2';
$db2   = 'db2';
$user2 = 'user2';
$pass2 = 'pass2';
$charset2 = 'utf8mb4';

$dsn2 = "mysql:host=$host2;dbname=$db2;charset=$charset2";
$options2 = [
    PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
    PDO::ATTR_EMULATE_PREPARES   => false,
];
try {
     $pdo2 = new PDO($dsn2, $user2, $pass2, $options2);
} catch (\PDOException $e2) {
     throw new \PDOException($e2->getMessage(), (int)$e2->getCode());
}
?>

Is this the right way to address this or is there a better way recommended to handle two DB connections kind of simultaneously?

The code for the connection is from this website: https://phpdelusions.net/pdo