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.

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

Yakuza Series Producer Talks About Future of the Franchise, Localisation, Samurai Spin-offs - KeenGamer

Yakuza Producer Addresses Yakuza Kenzan and Ishin Coming to the West

How to Play the Yakuza Games in Chronological Order - IGN

If these games were remastered (Kenzan and Ishin are localized of course) on modern consoles and PC, what would the collection be called ? : r/yakuzagames

Yakuza Dev Would Like Historical Spin-Offs Localized, But It's Complicated - GameSpot

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

Yakuza Ishin » SEGAbits - #1 Source for SEGA News

Ryu Ga Gotoku Ishin!, Yakuza Wiki

Yakuza Ishin! & Yakuza Kenzan! -Ryu ga Gotoku- (2Games) PS3 [Japan Import]

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