show which post type wordpress code example

Example 1: wordpres get_posttype

if ( get_post_type( get_the_ID() ) == 'slug_post_type' ) {
    //if is true
}

Example 2: check backend post type

function this_screen() {
  $current_screen = get_current_screen();
  if( $current_screen ->id === "page" ) {
    include_once 'page_admin.php';
  }
}
add_action( 'current_screen', 'this_screen' );