NBRT Wizard version # points to app or defs?

Hello Other Norton Products,

 

NBRT Wizard ver 3.0.0.66   vs.  NBRT Wizard ver 3.1.0

Does the NBRT ver # point to the Tool / Wizard (application/program) or does the NBRT Wizard ver # point to Sigs/Defs.

My Recovery CD was created with NBRT Wizard ver 3.0.0.66. 

Does ver 3.1.0. point to a change / improvement / fix for the Tool / Wizard or does ver 3.1.0 just point to newer defs. 

 

Thanks