I don’t believe so… normally I could make a component that uses one template, and then I could include for the component in both overrides… but our topic list items are a special type of template built for performance (hbr = handlebars raw template), and raw templates can’t use components. (Some previous discussion in Mounting widget in raw template? - #7 by angus)
That’s how Discourse’s CSS is structured (and some special HTML files for themes like header/footer/etc), but within the javascripts/discourse/templates directory those templates are direct overrides of Discourse defaults (when there’s not an override, the default templates are used).
In Discourse there are two templates: /templates/list/topic-list-item.hbr and /templates/mobile/list/topic-list-item.hbr. So since there are two templates, we need two overrides.
Maybe there’s an easy way to point mobile to the non-mobile template in the JS… but if there is I’m not aware of it!