I am not 100% sure exactly what you want to achieve, but if it has only another display for one page (instead, really change ALL the theme to include all functions, etc.), then -
You must create a page template and then select it from the drop-down menu for your page.
(in the sidebar - Attributes Page โ Template)
In this case, you can also use certain functions by adding them to the page itself (before exiting.)
For instance:
<?php function my_specific_page_function() {
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