I was thinking about moving from Ubuntu server to OpenSuse or CentOS.

I just have a few questions,

1. What changes when it comes to administration? ex. Changing network interface addresses, restarting services, elevating to root (sudo) and anyting else like that.
2. Is there a package manager like synaptic for RPMs?

I might add more if I think of anything,

I am still kind of a linux newbie so I can move pretty easily.