Gravity Forms submit one form values to another form

gfduplicate.php

<?php
add_action( 'gform_after_submission_n', 'wpdoin_after_submission_add_n_form_submission', 10, 2 );

/**
* Create a submission associated with the XYZ form, upon submitting the form with ID N. I.e. use the N form values to populate
* the XYZ form entries.
*
* @hook gform_after_submission_x
*/
function wpdoin_after_submission_add_n_form_submission( $entry, $form ) {
  // get the form values
	$fn         = rgar( $entry, '1' );
	$ln         = rgar( $entry, '3' );
	$email      = rgar( $entry, '4' );
	$sth        = rgar( $entry, '5' );
	
	$submission_data = [
		'input_1' => $fn,
		'input_3' => $ln,
		'input_4' => $email, 
		'input_5' => $sth,
	];
	
	// https://gist.github.com/rxnlabs/1bd931bb0261e53e882e9e7315bae8dc
	unset( $_POST['input_1'] );
	unset( $_POST['input_3'] );
	unset( $_POST['input_4'] );
	unset( $_POST['input_5'] );
	
	// Submit the form programmatically
	$result = GFAPI::submit_form( 1, $submission_data );

	// Check if submission was successful
	if ( is_wp_error( $result ) ) {
    // remove the echoes, if necessary. They will display below the form notification, if present.
		echo 'An unidentified error occurred. Please try again later.';
		// (think of logging the error instead) error_log ( $result->get_error_message() );
	} else {
		echo 'Form submitted successfully!';
	}

}