The difference between Shark Rocket NV480, NV482 and NV484 is the accessories they include, the vacuum body is identical.

Shark Rocket NV480 comes with a small 5.5″ Crevice Tool, Standard Crevice Tool, Dusting Brush, Small Turbo Brush.
NV482 includes a small 5.5″ Crevice Tool, long 18″ Flexi Crevice Tool, Dusting Brush, Small Turbo Brush and an Under Appliance Wand.
NV484 comes with a small 5.5″ Crevice Tool, long 18″ Flexi Crevice Tool, Dusting Brush, Small Turbo Brush, a Multi-Angle Dusting Brush and an Accessory Bag.
If you own these Shark Rocket Pro vacuum cleaners or know other difference between them, please share more details.
Here is a image that includes the tools, you can have a look at it below.

If you are interested in purchasing one or more of Shark Rocket Pro accessories, you can find them on Shark official website: http://www.sharkclean.com