Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi Andreas,
You can install 2 Office versions on your computer or uninstall one of it, depending on your preferred Office version to use. To answer your questions, it seems that you do have 2 Office versions installed on your computer. It's possible that the Office 365 (en-us & de-de) was pre-installed on your laptop or it was purchased using your Microsoft account. You can uninstall it on your computer if you prefer to use the Office Home and Business 2016.
Let us know if you need clarifications.