One of the best features of the 2023 version is that you don't have to choose just one language. You can keep the original English version and the new language pack side-by-side.
Your base AutoCAD 2023 is missing critical updates (e.g., you have 2023.0 but the language pack requires 2023.1.2). Fix: Run Autodesk Desktop App or visit manage.autodesk.com to download and install the latest AutoCAD 2023 Update (full update, not just security patch) before installing the language pack. language pack autocad 2023 full