Same form twice on the same page, but two different redirects

I found a solution to my problem myself. If enyone else needs it, here it is:

1. Install and activate ‘Contact Form 7 Modules’ plugin: https://www.ads-software.com/plugins/contact-form-7-modules/
2. Using the CF7 Modules plugin insert a hidden field in the form.
3. Insert this javascript in the form page template:

<script type="text/javascript">
jQuery(document).ready(function($) {
	$('#first-form-id #hidden-field-id').each(function(i) {
	    $(this).attr('id', 'hidden-field-id-first');
	    $(this).attr('value', 'first-form');
	});
	$('#bottom-form #redirect-hidden-field').each(function(i) {
	    $(this).attr('id', 'hidden-field-id-second');
	    $(this).attr('value', 'second-form');
	});
});
</script>

4. In your functions.php insert this code:

/**
 * Redirect Contact Form 7 submissions
 */
function wpcf7_redirections ($contact_form) {

	$submission = WPCF7_Submission::get_instance();

	$redirect_field_value = $submission->get_posted_data( 'redirect-field-name' );

	// Conditional redirects
	if ( $submission ) {

		if ( $redirect_field_value == 'first-condition' ) {

			$redirect_url = 'https://first-redirect.com';

		} else {

			$redirect_url = 'https://second-redirect.com';

		}

		$contact_form->set_properties( array( 'additional_settings' => "on_sent_ok: \"location = '" . $redirect_url . "';\"" ) );

	}

}

add_action("wpcf7_before_send_mail", "wpcf7_redirections");