Whenever I've seen local variants of World, it looks like the local provider crashes into the break with ads.
Yes, I'm not sure how much it happens now but as I say originally all the ads were locally inserted, the BBC didn't put any in (I remember someone telling me they weren't allowed to handle ads. If that was the case then obviously that rule changed by the time UKTV came along) and some did it better than others. I remember seeing one in Thailand ghat didn't seem to make any attempt to fit in the breaks.
multiple soundtracks like talkback for example.
I've no idea, I think it's unlikely though. I'm not sure if the vanilla version goes anywhere, it could be that the local versions opt out of the regional ones - America, Europe, Asia etc - they are widely available