Replace existing shortcakes with a new shortcode

functions.php

<?php
/**
 * Remove ShortCode Plugin
 *
 * This function will remove the shortcode from getting diplayed while keep displaying the content. 
 * Add this to your function.php
 *
 * @author  MetaBlogue
 * @license GPL-2.0+
 * @link    https://metablogue.com/wordpress-remove-shortcode-plugin/
 */
// Sample Shortcode to replace it with a new shortcode
function mb_test_shortcode_content( $atts, $content = NULL ) {
  extract(shortcode_atts(array(
        'arg1' => '',
        'arg2' => ''
    ),$atts));
  ////If the attributes are not same, you may need to format the attributes in below function call 
  return do_shortcode('[test2 arg1="' .$arg1 .'"]');
}
add_shortcode('test1', 'mb_test_shortcode_content');