At the moment, the IMPACT and Default LCI sources and templates are kept completely separate and are not interchangeable. Once a Project is created using one LCI source, you will be unable to change it to another LCI source after that. If you need your project to be in the other LCI source, you can only do so by creating a whole new Project in the correct LCI source. This also means that you will need to remodel your whole Design again since there are two separate collections of templates for the two LCI sources and the original Design can’t be translated into the new LCI source.
Our users have previously requested a feature to make it possible to have the two LCI sources within the same Project in eToolLCD, please read more about it here: https://support.etoollcd.com/index.php/idea/use-multiple-lci-sources-in-the-same-project/