These are 2 different types of vacuum cleaners.
Shark Rocket (HV300, HV301, HV302, etc.) is a 2-in-1 vacuum, you can use it as an upright vacuum to clean from bare floors to carpets; or you can detach the floor nozzle and use it as a handheld to do some small quick pick ups around your house and cars.
Whereas the Shark Rocket Professional (NV480, NV482, NV484, etc.) is a slim and lightweight upright vacuum that could replace your bulky/heavy vacuum cleaner.

Shark Rocket vs Shark Rocket Professional

	Shark Rocket	Shark Rocket Pro
Design	Upright, Handheld 2 in 1	Upright
Bagged or Bagless	Bagless	Bagless
Dust Cup Capacity	0.472 dry quarts	0.8 dry quarts to the fill line and 1.8 dry quarts of real usable capacity
Corded or Cordless	Corded	Corded
Cord Length	Depending on the version you purchased, HV300 = 27', HV301 = 30', HV302 = 30', HV302Q = 30', HV300W = 32'	30'
Power	120V., 60Hz, 500 Watts, 4.2 Amps	120V., 60Hz, 700 Watts, 6 Amps
Brushroll Speeds	2 speeds, slow speed for cleaning bare floors and delicate area rugs, high speed for cleaning carpets.	brushroll has only one speed to clean carpets, and equip with a brushroll indicator to tell you if there is jam.
Weight	under 8 pounds	13 pounds
Dimensions	46" x 9.8" x 10.5" (H x W x D)	45.28" x 11.3" x 14.1"
Filtration	Washable Filters	Sealed vacuum technology with Washable HEPA Filter
HEPA Filter	No	Yes
Wall Mount	Yes	NA
Headlights	No	Yes
Swivel Steering	Yes	Yes
Suction Control	No	No
Color	Orange and Blue	steel gray with orange accents
Manual	Shark Rocket Manual Download Link from Official Site	Shark Rocket Pro Manual Download Link from Official Site

If you know other difference between Shark Rocket (HV300, HV301, HV302, HV302Q, HV300W) and Rocket Professional (NV480, NV482, NV484,…), please share below.