The Kompressor has a narrower base than the CC/Neon. That and the materials used in the padding are the only difference.
There are plenty of people out there with 3 year olds still under the line & resurfacing in these seats so you'll get plenty of use out of it.
I'd definitely suggest a 0-4 seat though, as new and better designs are constantly being released and by the time your bubba outgrows it there maybe something even better available in the larger seats. The companies are always trying to make convertible boosters taller and slimmer to further utilise the concept of extended harnessing.
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