OES SP1 and SLES SP2?

Yohoo!

We've downloaded the OES SP1. It includes the SLES9 core-CDs as from RC5.

For SLES9 there is SP2 available, three CDs.
I'm wondering how the core9 part from the OES is upgraded. When I
install OES SP1, will I have to upgrade many core9 fixes via RedCarpet?

Or, in other words:
Where are the fixes for the core9 in the OES SP1?
To prevent our servers from downloading every core9 fix, can I use the
SP2 CDs from SLES9 to upgrade?

And, as an additional question:
What about the Novell Linux Small Business Suite (NLSBS9)? Can I upgrade
the core9 part with the SP2 CDs?

THX & greetings from Germany

Christian