The name "Gradius" is a misnomer; the space fighter jet on the card is named "Vic Viper". "Gradius" is actually the name of the planet that the Vic Viper defends. The Japanese name of this card "Super Dimension Fighter: Vic Viper" is the correct name of the fighter itself. The "Victory Viper XX03" is more appropriately named.
While Gradius has the support cards Cyclone Laser and Gradius' Option, Victory Viper XX03 has a built in effect to power up for destroying enemy monsters - a nod to the video game's "power capsule" mechanic. Victory Viper XX03 can be reasonably concluded to be a "retrained" version of this monster.