Hiryu jigoku is just KoH varient of Ultora Gari
It's Upgraded Form of Hiryu Kaen
Tora Gari is already Upgraded to UI Tora Gari
And for King of Hell Upgrade, We simply add King of Hell to Attack Name
Just like Oni Giri ---> [Rengoku] Oni Giri ---> [King of Hell] Rengoku Oni Giri
So We would have Tora Gari ---> [UI] Tora Gari ---> [King of Hell] UI Tora Gari
And Hiryu Kaen ---> [103-Jo] Hiryu Jigoku ---> [King of Hell] 103-Jo Hiryu Jigoku
It's his Signature Finisher when Attacking from Sky
Each Technique has it's own use