That is the issue, nobody knows for sure. It completely depends upon the case officer. See below instance from DIAC advisory:
"Unrelated qualifications which cannot be assessed by your assessing authority can be assessed by VETASSESS.
It is prudent to seek the opinion of the relevant assessing authority on your skilled employment and qualification claims
before you lodge your EOI"
On basis of this your CO may reject your application. So, its better to have your qualification assessed.