update-donor-email-using-profile-editor-shortcode-givewp.php

<?php
/**
 * This code snippet will help you update the email address on donor as well as WP user profiles when donor updates the email address
 * using legacy donor profile `[give_profile_editor]`.
 *
 * @param int   $user_id  WP User ID.
 * @param array $userdata WP User data.
 * 
 * @return void
 */
function custom_prefix_update_donor_email( $user_id, $userdata ) {
	// Get GiveWP donor data.
	$donor = new Give_Donor( $user_id, true );

	// Update email to donor profile only if the email in donor profile doesn't match with the submitted one.
	if ( $userdata['user_email'] !== $donor->email ) {
		$donor->update( [
			'email' => $userdata['user_email'],
		] );
	}
}

add_action( 'give_user_profile_updated', 'custom_prefix_update_donor_email', 10, 2 );