WordPress 3.0 / WPMU 3.0 Are they exactly the same?

I have been reading in a few places that WordPress 3.0 now has multiblogging. I'm wondering if WMPU 3.0 and WordPress 3.0 are now exactly the same.

If they are, can I install all of the WMPU plugins for 3.0 into Wordpress 3.0?

I just started building my WordPress empire so maybe its a good idea to start fresh with Wordpress 3.0 if its the same because I upgraded my WPMU to 3.0 and am getting a few warning messages.

Any thoughts on these points would be great.