How to filter title?

I want to change the title based on the category. For example, if the current post is in category x or y, use title a, else use title b.

Here’s the code I tried using:

add_filter( 'related_posts_by_taxonomy_shortcode_defaults', 'related_shortcode_title', 10, 2 );

function related_shortcode_title( $defaults, $post ) {
    
	if ( has_category('44,45') ) {
	$defaults['title'] = 'Related Products';
	}
	else {
	$defaults['title'] = 'Related Posts';
	}
    
	return $defaults;
}