To determine the best filter to use, you have to determine what those pages are. Is is_page() true? Use the page_template filter. Is is_post_type_archive() true? Use the archive_template filter.
All of the query type-specific template filters are listed here.
You can also use the generic template_include, which fires for all types.
Within any of these filters you can check the same conditions you need to determine if you need to load the template-gallery.php template.
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