What is the difference between this new version and the seat before?

Compared to its predecessor, this seat has been upgraded with 3 new features:
1. The Dynamic Force Absorber™ in the headrest takes side impact protection to a new level
2. The additional side impact protection SIP+ is now designed with a slide-on construction for quickly and securely attaching it to the seat
3. The Ergo-Move Shoulder Pads™ are developed based on insights from the back-development experts AGR and give the child added movement space for the arms

Onto which base does this seat fit?

This seat fits onto the iZi Modular i-Size base. There are no changes done to the base itself, so that all versions of this seat fit onto the same base.