@EA_Atic I'm beginning to wonder if Death Watch wasn't actually a splintering off from the Watch. Bo Katan told Din Djarin that he was a child of "the Watch".
Din and his covert operate VERY differently from Death Watch...almost polar opposites. Death Watch was very much "win at all cost". The Clone Wars Season 4 episode "A Friend in Need" is where Ahsoka meets Bo Katan for the first time. In that episode, Death Watch is bullying and enslaving a local village. So they don't operate on anything but an absolute basic code of warrior honor. That's also why they would align themselves with Dooku and then Maul.
Din and his covert operate with almost a samurai type of honor code, doing what is honorable and right by everyone around them and with each other.