Doesn't Sky News Australia take the UK channel as filler in overnight hours?
Here's a comparison between the 'UK' and Australia services.
What I noticed also is the 'UK' service has the DOG
on top of the domestic logo used on Sky News Intl and there are trailers for Fox Sports, which may suggest that it's a News Corp Australia channel rather than Comcast providing the service bar the feed from London.
When the Sky News/NBC channel launches, it may be an idea to rebrand Sky News International as Sky News UK, so that viewers are aware of the differences between the two channels.