wp_restore_post_revision_meta( int $post_id, int $revision_id )

Source

function wp_restore_post_revision_meta( $post_id, $revision_id ) {
	$post_type = get_post_type( $post_id );
	if ( ! $post_type ) {
		return;
	}

	// Restore revisioned meta fields.
	foreach ( wp_post_revision_meta_keys( $post_type ) as $meta_key ) {

		// Clear any existing meta.
		delete_post_meta( $post_id, $meta_key );

		_wp_copy_post_meta( $revision_id, $post_id, $meta_key );
	}
}

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