The Australian CPL exams are easier than the EASA CPL exams.
You get 2 years to complete the CASA exams , there is no ground school sign off, you can sit them when you like.
You can not do the ATPL exams in Australia , without first completing the CPL exams.
The EASA are more in-depth.
You can convert the EASA far easier then the other way round.