At present there is no conversion from an Australian CASA licence to an EASA licence. You basically have to start the EASA licence from scratch.This means sitting all the module exams which are the equivalent to our basics. If you have any type ratings then your type courses will have to redone at an EASA 147 approved training centre. As far as I have been told from the UK CAA and a few other JAA countries the only excemption that we may get is on the practical experience if you can show this in a 145 approved maint organisation. Hope this helps.