Not sure about Tiger, but I joined SLK as DEFO. So there are always exception if you are what they are looking for.
But package is unified as one, no more expat/local differentiation.
I do hold CASA licence, but I used my HKCAD ATPL for conversion. So Air Law is the only subject I need to take. But be prepare if going thru the whole CAAS ATPL is necessary, it will be a long and pain process.