Your suspicion is correct! Brazilian and European Portuguese can sound pretty different, and we also have differences in vocabulary and expressions, even though we can (usually) understand each other haha.
I'd be happy to help test the PT-BR version when it's available! I can take a look at the translations and give you feedback on the pronunciation as well.
Feel free to reach out if you need an extra pair of eyes (or ears 😂) when the future v1.0.3 update comes out!