Are 'Kenzan' and 'Ishin' Related as 'Yakuza' Game Spin-Offs?

Are "Yakuza Kenzan" and 'Like a Dragon: Ishin!' related? These two spin-offs take place at different points during the feudal era of Japan.
Are Yakuza Kenzan and 'Like a Dragon: Ishin!' related? These two spin-offs take place at different points during the feudal era of Japan.

Ryu Ga Gotoku Ishin!, Yakuza Wiki

Yakuza: Ishin - IGN

The next Yakuza game is in development - Gematsu

Kenzan Kiwami Might Never Get A Remake, Says Developer

Ryū ga Gotoku Kenzan! - Wikipedia

Like A Dragon Ishin! review More than a spin-off

Historical Yakuza spin-off Like A Dragon: Ishin! is being remade, coming to PC next year

龍が如く 維新！ Yakuza: Ishin!: Spin-off Ultimate

Yakuza Restoration Announced - IGN

Like a Dragon: Ishin! Review

Yakuza: Ishin and Yakuza: Kenzan Could Get Western Releases Due to Ghost of Tsushima's Popularity - Niche Gamer

Yakuza Survey Hints at Feudal Japan Spin-Offs Potentially Coming West

Games/spin off concepts,here we gooo : r/yakuzagames

What Are Yakuza Ishin and Yakuza Kenzan and How to Get Them in English - GameRevolution