Well, I was given credit for all of the science units of study I'd taken at USYD. I'll give you an outline of the typical program structure at UNSW, divided by years and semesters -
<table cellspacing=5><tr><td><font face="verdana, arial, helvetica" size="2" >
Pure
Year 1
Foundations of Law (6 cp)
Science units of study (18 cp)
---
Torts (6 cp)
Science units of study (18 cp)
Year 2
Contracts 1 (3 cp)
Public Law (3 cp)
Criminal Law 1 (6 cp)
Science units of study (12 cp)
---
Contracts 2 (6 cp)
Criminal Law 2 (6 cp)
Science units of study (12 cp)
Year 3
Property, Equity & Trusts 1 (6 cp)
Law, Lawyers & Society (6 cp)
Science units of study (12 cp)
---
Property & Equity 2 (6 cp)
Administrative Law (6 cp)
Science units of study (12 cp)
<td><font face="verdana, arial, helvetica" size="2" >
Transfer
Year 1
Science units of study (24 cp)
---
Science units of study (24 cp)
Year 2
Foundations of Law (6 cp)
Contracts 1 (3 cp)
Public Law (3 cp)
Science units of study (12 cp)
---
Torts (6 cp)
Contracts 2 (6 cp)
Science units of study (12 cp)
Year 3
Criminal Law 1 (6 cp)
Property, Equity & Trusts 1 (6 cp)
Law, Lawyers & Society (6 cp)
Science units of study (12 cp)
---
Criminal Law 2 (6 cp)
Property & Equity 2 (6 cp)
Administrative Law (6 cp)
Science units of study (12 cp)</table>
The normal course load is 24 credit points per semester. The transfer student is forced to overload in third year, if they make no other arrangements (and still wish to complete the combined degree in the alotted five years). That's the situation I'll be in, unless I'm successful in working out a compromise with the computer science department.
I could avoid overloading by tacking another semester on to the end of my degree, but I don't particularly want to do that. There are dozens of transfer students, so I'm sure they'll have created some kind of popular arrangement in the past - though I haven't had time to look into exactly what that is yet.
With regard to your second query; whilst you will graduate with a degree from USYD (and it will state that on your transcript), it will also show your first-year courses as being undertaken at another university. I dislike the idea mainly due to the fact that each law school has their own agenda and emphasises different things; UNSW law is taught fairly differently to USYD law, for example. Don't ask me which is "better".
Hope some of that incoherent mess helped.