The 310-092 exam is an update for people that have another version certification of Business Component.
This exam has 50 questions and 120 minutes to do.
The 310-091 exam is made for people without this certification, for new participations. This exam has 61 questions and 145 minutes to do.
I don't know about assignment objectives, but you can compare them side-by-side with this 2 links:
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http://www.sun.com/training/catalog/courses/CX-310-091.xml -
http://www.sun.com/training/catalog/courses/CX-310-092.xml Regards
Elton Kuzniewski<br>SCJA 1.0, SCJP 5.0, SCWCD 5.0, SCBCD 5.0, SCJD (B&S - working on project),
<br><a href="http://www.eltonk.com.br/" target="_blank" rel="nofollow">www.eltonk.com.br</a>