Custom panels-pane tpl based on some identifier
After a lot of working around &amp; trial &amp; error methods, I got this.


Copy your "panels-pane.tpl.php" in your current theme's template directory.
include dpm($pane); in a php tag. This will give u the list of all the panes on ur current panel page.
Note down the pid ($pane->pid) here. 


If you are looking for a particular page the unqiue identifier for that whole page would be did ($pane->did) which is the display id.
Basically, every panel page has a unique did (display id) &amp; different pid (pane Id) for all the panes on that particular page.

Now in your "panels-pane.tpl.php" in the div code block with class="pane-content" you could write a php code like

if($pane-&gt;pid=='some id' &amp; $pane-&gt;did=='some id') {
//modify your pane data from the variables at $pane-&gt;configuration &amp; store in $content.
   $content = your modified data;
   print render($content); // render this pane with my modified data
else
print render($content); // (and) render other panes as normal
}