Please explain the last chapter… did they reincarnate or what? 😢

im pretty sure the karel in the spin off was the child borned by the baby karel and sasya took care of and raised. the only reason I THINK why the karel in the final acts and looks like karel (which lowk seems stupid cuz it's not like they're related to karel but eh) was because the author & artist wanted it to be like that, making it seem like they reincarnated but it's all for the interest of the story hence why they look like karel and sasya... it doesn't really make much sense though (i love this story btw but im just putting my thoughts on it lol)