As Mistyfying said - most of the units would be similar if not identical and at any tafe I have experienced they are always keen to give you recognition for anything that you have already done.

Generally a specific admin course will include a couple of units in relation to terminology and practices that are specific to the area.

If you were keen I would make an appointment to speak to the course coordinator who should be able to let you know exactly what they can do for you.

In my experience of hiring admin staff in the law area having a good grounding in the basic admin skills has always been far more important as usually people could pick up the industry terms and methods quite quickly if they were interested and wanted to learn.

Good luck