probably a silly question...but i always assumed the Southern Hemisphere had a very different night sky than the Northern hemisphere...so I did a quick search and read that we have some overlap of our skies along with unique areas, too.
For example, in the Southern hemisphere the Big Dipper (or the Plough to our British friends) is visible only North of 25 degrees latitude South (Northern half of Australia, for example)..and it appears upside down to them vs our view!
And the Southern version of our North Star is the Southern Cross...which is visible in the US only from the Florida Keys or Hawaii!