There should be no diference in map on DVD vs. CD, however CD will cover relativly smal area, and DVD whole Australia ?, Not shure there but in EU, DVD covers whole Western Europe on Detailed level, While CD covers One country on detailed level and Major Roads of Europe (two countries if they are small)

I dont know about BMW Australia, but BMW in general started with MK IV in 2003

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X5 4,4i-06 Current
330Ci Cab-03 2007-2008
MB E55 AMG-03 2006-2007
Z3 2,8 Roadster-98 2006-2007
X3 2,0d-05 2005-2006
320d-99 1999-2005