Different.
I recently downloaded the new album by Robert Plant and Alison Krauss, Raising Sand. (downloaded legal MP3s from Amazon - more on Amazon's downloads later)

The album is certainly not for a Zep fan. Don't expect anything close to Led Zeppelin here, or even Strange Sensation.  Don't even think 'Rock.'   It's listed as Adult Contemporary at Amazon, and I would say that's a pretty good description.  Isn't Norah Jones 'Adult Contemporary'?  OK, it's not like that. Perhaps more like the Tori Amos version of Down By The Seaside?

But, for Robert Plant fans, the ones who appreciate his solo work and his reworking of classic Zeppelin songs, this is just another interesting path.