You can insert in your template something like:

<?php if (return_page_slug()=='thatpage') get_component('thatcomponent'); ?>

(replace thatpage by your page identifier (slug) and thatcomponent by your component id.)

...Or you could use the DynPages plugin.

If you give every component the same id as their corresponding page slugs, you can insert this in the sidebar:

<?php get_component(return_page_slug()); ?>

That is, a page with slug my-page would display component with name my-page (if that component exists).

Do those pages have something in common? (same parent page, or some string in the page slug, ...)

If not, something like

<?php 
if (in_array(return_page_slug(),array(
    'slug1'
    ,'slug2'
    ,'slug3'
    // ...
    ,'slug20'
    ))) get_component('componentname');
?>

might work (not tested).

Then it's easier:

<?php if (get_parent(0)=='parentpage') get_component('componentname'); ?>

my question to this topic is that how would i have a topic header in the sidebar identified as per page then the content that i want in that sidebar ?