different template to page content

conditional tags:
https://codex.www.ads-software.com/Conditional_Tags

https://codex.www.ads-software.com/Conditional_Tags#A_PAGE_Page

might not work if you are showing multiple pages – then try

if( $post->ID == 37 )
where 37 would be the page ID

depends on the code of your template so far.

I just can’t get it to work.

the code i have.

Anyone ?

with your code, it might be something like this:

(i have no idea where you want this <div class="img"> different content </div>; if it is instead of the other content, or what. )

<?php if( $page->ID == 37 ) { ?>
<div class="img"> different content </div>
<?php } ?>

you need to find the page ID of that one page and enter it instead of 37.

if this is not it, you need to provide more detailed information.