🍏 I would say it depends on the context. Here are a couple examples: 1) Let's pretend I'm a personal trainer. My client is improving their daily habits and is becoming more healthy. I might say to him or her, “That's more like it.” This communicates that they're doing better than they were before. We're comparing past behavior with current behavior. I might also say, “That’s it. That’s how we do it.” I say this in an encouraging way to communicate that my client’s current actions are correct and effective. 2) “That's it” can also be a response when we no longer have a supply of something. In other words, when something has run out. For example, let's say I donate clothing to poor people. After I'm all finished donating, someone comes up to me and asks for more. I say, “I'm sorry that's it. I have no more.” In situation #1, “that's more like it” and “that's it” have similar meanings. However, in situation #2 “that's it” is completely different than “that's more like it”. I hope this helps you. Great question! 😎👍🍎

Yes, it's the same, but one doesn't come from the other. 'it' in your sentences is acting as a pronoun. In those cases, it means something like 'the situation we want'.