How to load page template according to the Searched Page

i have a search form which uses RELEVANSSI plugin to perform search and display Search Results. On my Search Results page there is pagination and Search Filters(hyperlinks) which allows user to show 10, 20 or 30 records on screen.

The Issue:
In my website I have some internal pages which have different HEADER AND FOOTER and a Search BOX. By adding some checks If user performs search from these internal pages then it will load relevant and correct header and footer. But if I click on Pagination Filter or Search Filters (Show 10 Records, show 20 records) then it will load main website header and footer.

I need a way to pass some variable which recognizes that from which page user come and according to that variable it will load header and footer.

Here is my sample code:

<?php
$ref_url = $_SERVER['HTTP_REFERER'];//getting referral url
$ref_url_final =substr_replace($ref_url ,"",-1); //removed last slash from url
$page_slug_val = substr($ref_url_final, strrpos($ref_url_final, '/') + 1); //Get characters after last / in url

print "eliab=";
if($page_slug_val=='custom-template')
{
	get_header('custom');
	get_template_part('page-templates/page','search');
	get_footer('custom');
}

else
{
	get_header();
	get_template_part('page-templates/page','search');
	get_footer();
	
}
?>

And here is the code of Page-Search.php

<?php
<?php 
						/// For Filters ///
	$query_string = $_SERVER['QUERY_STRING'];
	$posts_10=add_query_arg( 'posts_per_page', 10, $query_string );
	$posts_20=add_query_arg( 'posts_per_page', 20, $query_string );
	$posts_30=add_query_arg( 'posts_per_page', 30, $query_string );	
?>
</header>
	
<div class="container">
	<div class="row">
		<div class="col-lg-12">
			<div class="ps19-content">
				<div class="ps19-search-content">
					<?php
					if(have_posts()):	
												// Calling Custom Search Form //
						add_filter( 'get_search_form', 'custom_search_form_2' );
						get_search_form();
						remove_filter( 'get_search_form', 'custom_search_form_2' );
					?>
					<div class="ps19-search-result-controls">
						<div class="ps19-search-total-result">
						<?php
													/// Getting Current Page ///
							$current_page_id = (get_query_var('paged')) ? get_query_var('paged') : 1; 
							echo " ".$wp_query->found_posts." results for <strong>". get_search_query()."</strong> ";
						?>
						</div>
						<div class="ps19-result-per-page">
							<span>View:</span>
				<a <?php if($_GET['posts_per_page']=="10" OR $_GET['posts_per_page']=="" ){ echo "class=\"active\"";} ?>
								 href="<?php echo '?'.$posts_10;?>">10</a>
				<a <?php if ($_GET['posts_per_page']=="20"){ echo "class=\"active\"";}  ?>
								 href="<?php echo '?'.$posts_20;?>">20</a>
				<a <?php if ($_GET['posts_per_page']=="30"){ echo "class=\"active\"";}  ?>
								href="<?php echo '?'.$posts_30;?>">30</a>
						</div>
					</div>
					<?php
						while(have_posts()): 		
						the_post();
					?>
					<article class="ps19-search-result">
						<h2 class="ps19-search-result-title">
							<a href="<?php esc_url( the_permalink() ); ?>" title="Permalink to <?php the_title(); ?>" rel="bookmark"><?php the_title(); ?></a>
						</h2>
						<a class="ps19-search-result-link" href="<?php esc_url( the_permalink() ); ?>"  title="Permalink to <?php the_title(); ?>" rel="bookmark"><?php the_permalink(); ?></a>
						<div class="ps19-search-result-desc"><?php the_excerpt();?></div>
					</article>
					
	   
					<?php
					endwhile;
					
					wp_pagenavi(); //calling pagination
						else: 
						echo "<h4 class='alert alert-danger' >No Result Found</h4>";
					endif;
?>
					
<?php 

if (isset($wp_query->query_vars['parvar']))
{
print "P=====".$invoiceno = $wp_query->query_vars['parvar'];
}

					

?>

Kindly guide how to fix this issue.

Thanks