Yep, the pronunciation of "Bunga" in most Romance languages ends up being "Banga". It is so in European Portuguese, as well.
Speaking of the EU PT dub, here is a clip of TLG:RotR! Kion's voice isn't exactly like the English one and definitely a traditional "EU Portuguese voice for kids", but I think it's cute and fitting, in the end. After all, he is a cub.
https://youtu.be/RIrjT-7iPN4Here's a smaller 'trailer' too. If I'm correct, the voice of Simba is the same as in TLK II, which is great news for us here.
https://www.youtube.com/watch?v=IaQ4cm80eco