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An Australian metric cup is exactly 250mL. A US cup is 236.6mL — about 5.7% smaller. That sounds tiny, but across a whole recipe it can genuinely affect baking. If a recipe's origin isn't obvious, American recipes almost always mean the US cup.
An Australian tablespoon is 20mL. Nearly everywhere else — the US, UK, and most "international" references — a tablespoon is 15mL. Using an Australian tablespoon to measure an American recipe's tablespoon quantities will genuinely over-measure by a third.
A cup measures volume, not weight, so how tightly an ingredient is packed changes the answer — scooped flour can weigh 20% more than spooned-and-levelled flour. The figures here are standard, widely-used approximations. For anything where precision matters, weigh with a kitchen scale instead.
Unlike ingredient weights, these are fixed mathematical relationships (an inch is defined as exactly 25.4mm) — there's no approximation involved, just arithmetic.