Most of the templates in our library are pretty ‘old’ as in they were created with datasets that are now superseded. However, this is not an issue because the LCI source/dataset you have specified for your Project will over-ride the LCI source/dataset of any template you add into your design. So, as long as you have the correct LCI source selected in your project, all added templates will grab the same data from the back end, even if they were originally created in an older version or a different country (but from the same LCI group).
The only other issue you may find relating to this topic is when your project has a different LCI group from the template. Please refer to this FAQ for more information: Why Can’t I Add Certain Templates to My Design?