Not exactly. The language pack is an add-on that changes the interface language of an existing installation. Downloading the full software in a different language is typically done when you do not have any version of AutoCAD installed.
It saves hard drive space by sharing core software components across multiple languages. Autocad Language Pack 2021
Budget approximately 300 MB to 1 GB of free disk space per language pack. Step-by-Step Installation Guide Not exactly
Language packs sometimes default to online help, which might revert to English if your internet connection is unstable or if the localized offline help was excluded. Autocad Language Pack 2021