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.

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

Yakuza Kenzan Encyclopedia MDPI

SEGA News Bits: SEGA Survey Asks About Yakuza Kenzan & Ishin Localizations? » SEGAbits - #1 Source for SEGA News

Finally decided to import Kenzan! Also came with the guide and Ishin for PS4. Gonna have fun playing these! : r/yakuzagames

Yakuza Ishin y Kenzan necesitarían un remake para poder verlos en Occidente - Meristation

Yakuza Like a Dragon Kenzan Walkthrough Part 1

Yakuza Producer Would Like to Bring Yakuza Kenzan and Yakuza Ishin to the West

Is Like a Dragon a spin off? : r/yakuzagames

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