The Riccar 8 Series uses type B bags where as the Vibrance uses type A bags. Both of them can fit either one but the type B bags are bigger because the 8 Series's bag compartment is bigger than the Vibrance's bag compartment, that's the big reason why Tacony made different types of bags for each one. The type B bags also have what's called a Dust Guard where you can seal the bag collar after removing the bag, the type A bags don't have that.
The blue model is the Vibrance Standard. It's got a 12 amp motor, both the brushroll and bottom plate is metal, and it uses standard electrostatic filters. Simplicity sold the red version of this from the Symmetry models.