Guitar Rig update

I have a quick Q re: Guitar Rig versions bundled with Sonar vs NI Guitar Rig new version releases. ( I also just posted this in Sonar Producer and Studio and was asked to move it, sorry for the dupe).
I see today from KVR or Rekkerd (one or the other) that Native Instruments has updated Guitar Rig to version 5.1.0.

The version (I'm using Sonar Producer 8.5.3) listed in my vst folder is 3.2.1.4 (Guitar Rig 3). Are we talking the same beast here? Is my version a Cakewalk "light" version or do I go ahead and update my Guitar Rig via NI to 5.1.0?

Also, I have purchased X1 but not downloaded and installed yet, that comes after I finish my current crop of projects. Does X1 contain the same  Guitar Rig beast / version as 8.5.3 or is it an upgrade / update?

Thanks for any insight on this.

Robby