Hello, I noticed on the store pages for Divine and Beyond Divinity that there are different localizations available. Is there any way to change the dub for either of these games? Would I have to download the installer in a different language and switch some files around? Couldn't seem to find any info on this on pcgamingwiki, so any help would be much appreciated.

Yes. If you want German language, you need to download the German installer.
But you don't need to switch any files around. Just as the English installer only installs the localization folder for English.
The German one only installs the German one, and the language in your config.lcl will default to 2.