Please watch this overview: https://www.youtube.com/watch?v=jyJNnc9eFHI
SkyBox has 2 modules:
SkyBox Creator and SkyBox Converter.
You can create 360/VR motion graphics within After Effects.
SkyBox Studio has 4 modules:
SkyBox Creator, SkyBox Converter, SkyBox Extractor and SkyBox Viewer.
If you want to import and work with 360 footage, and preview it within After Effects, SkyBox Studio is the right plugin for your needs.