Not quite an answer to your question but just to show how fickle the process is ! I use my EASA ECG and blood tests for my CASA medical and do foreign IPC’s with EASA examiners. A gotcha is that CASA doesn’t recognise all the EASA aviation authorities! Austria 🇦🇹 is one they have trouble with, Greece 🇬🇷 Is another. Check the latest 61-4P CASA form , for the list of agencies.