In the WHMCS template files you can actually set content/code to display/load on pages of your choice. This is especially useful for the header.tpl and footer.tpl files as the same files are loaded for most of the pages (with the exception of viewinvoice.tpl).
A single page
A single page with fallback (else)
The same content/code on a selection of pages
Different content/code on a selection of pages
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