I'm based in Australia, worked for BCG Australia, and know MBB intimately down here, so let me help :)
1) Pay/perks - generally higher in Australia
2) Worklife balance - much more emphasized in Australia. They take weekends seriously (we rarely worked weekends), they strive to meet personal KPIs during the week (i.e. teams hold you accountable to meeting 1-2 personal life needs each week), they're conscious of burnout (at BCG for example you get 2 free "ME" days each year), etc.
3) Culture - More flat and "conversational" in Australia
4) Projects/Industry - Australian work involves Mining, Oil & Gas, Energy, Public Sector/Government, Telecomms, Financial Institutions, Consumer Products. They're also quite strong in Technology advantage (Platinion/GAMMA)
SE Asia would have a lot of finance, oil & gas, mining, manufacturing.