>>283601849
The anime also translated it as Fire God. But even if we disregarded that the other points still stand, the Fire God still looks like Gear 4, and Roger just used fire god swordsmanship.

>>283601835
Zoro literally unlocked his King of Hell form which coats his sword in flaming green haki the exact same way Roger unlocked his "Fire God" swordsmanship >>283601269, by disregarding his own safety and dumping all his haki out as advanced CoC even if it kills him. Oda even made sure to tell us Zoro was using advanced CoC with King of Hell.

Zoro likely inherited the Fire God of Wano's swordsmanship.