Australian English is closer to British English in both vocabulary and spelling. Meanwhile, Philippine English is closer to American English. However, as long as you have sufficient English skills, you’ll be able to understand one another without any significant problems.  They use a lot of slang you’ll likely learn as you work there. It’s probably more important to get used to their accent rather than worrying about the differences in vocabulary.   You can try listening to any available Australian media online as practice. That way, you can comfortably converse with the people you meet there once you arrive.