This is a Z'Gok

Z'Gok (Char Custom)

Dragonar

+Cavalier

Same name

Has a horn Same name No horn

The Amazing Z'Gok is an unit based on the Z'Gok (Char Custom)

While the Amazing Z'Gok is the combined form of Z'Gok and Cavalier

The Amazing Z'Gok has a horn despite the Z'Gok doesn't have one due to a Char Custom unit gives the image of a horn

Considering the lore settings there is a possibility that the Amazing Z'Gok is based on the Amazing Z'Gok

Spoiler The Cavalier Aifrid in SEED Freedom is based on the Cavalier in Metal Armor Dragonar

Sigmebud Respect in Grongi

Based on

Came first IRL

Came first in lore