Templates can be created in the Shared category when they apply to all metaclasses. They can also be created at the metaclass level or for a given stereotype or criterion.
You can use the Browse tool to find all templates of the same name. To do so, open a template, position the cursor on a template name in-between % characters, and click Browse (or F12). This opens a Result window that displays all templates prefixed by their metaclass name. You can double-click a template in the result window to locate its definition in the resource editor.