This code snippet replaces the default featured image meta box on a specific post type in the WordPress admin

replace_default_featured_image_meta_box.php

/*
Please note:
The code uses __replace_with_post_type_slug__ which needs to be replaced with the actual post type slug where this functionality is desired.

Also replace ___replace_with_new_name___ with the new name you wish to use.
*/

add_action( 'admin_head', 'replace_default_featured_image_meta_box', 100 );
function replace_default_featured_image_meta_box() {
    remove_meta_box( 'postimagediv', '__replace_with_post_type_slug__', 'side' );
    add_meta_box('postimagediv', __('___replace_with_new_name___'), 'post_thumbnail_meta_box', '__replace_with_post_type_slug__', 'side', 'high');
}