Okay, no. I'm sorry, but no. I hate when people talk about Kindred being Jhin (But hey, maybe it's a legit theory that I just haven't heard all of). Look, Jhin and Kindred are associated with each other because of this: Riot wanted to make a "Bounty Hunter" character, so they first thought up this cyborg cowboy guy who could collect bounties on other champs (and maybe jungle monster, I dunno). Originally, his ult was going to be a near-global range Lux ult with a tiny hitbox. If you were able to land this on a "Bountied" champ, it would be an insta-kill. This eventually just became Jhin's E. Anyway, they iceboxed Jhin. While working on Kindred, they decided that the bounty system worked better with them, so they took it from Jhin and gave it to Kindred.
If they share similar quotes it's probably an easter egg or reference to this relationship.
…Geez, why did I write so much?