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 » SEGAbits - #1 Source for SEGA News

Yakuza's producer wants to bring Japan-only games Kenzan and Ishin to the west

Sega Europe: No Plans for Yakuza Ishin and Kenzan Release In West

Yakuza Kenzan Remake Would Need A Lot Of Time And Money,, 46% OFF

Samantha Lienhard - Readers and Gamers Unite

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

Can you play Like a Dragon: Ishin! on Steam Deck? - Dexerto

The Great Ace Attorney Chronicles Proves It's Time To Localize Yakuza Ishin and Kenzan

Yakuza Kenzan Remake Would Need A Lot Of Time And Money,, 46% OFF

Yakuza: Ishin - IGN

Yakuza 8 devs can't decide what their game is actually called

Like a Dragon: Ishin! - Wikipedia

Could anybody tell me how these connect to the mainline games? : r/yakuzagames

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

New Ryu Ga Gotoku Ishin details from Dengeki Playstation - Yakuza Fan