Well yeah. All Mexican food is pretty much the same. "Meat, cheese, beans, and vegetables in a tortilla." Quick, which Mexican food did I describe there? The answer is all of them.
Well okay, maybe bagels were a bad example, but Dunkin' Donuts also serves bacon egg and cheese flatbread sandwiches, which have no holes. They also sell turkey sandwiches which aren't even breakfast. Also, Dairy Queen sells hot dogs, hamburgers, chicken strips, and fries, and "dairy" is even more vague than "donuts."
To answer your second question, we really don't need 60 carbon copies of the same network. That's very true. Still, when it existed, CN Real didn't make CN a carbon copy of Nickelodeon...CN still showed mostly cartoons except for a few hours a week. Now, the question is, and it cannot be answered because CN Real was of course axed almost a year ago, is "If CN Real had been successful, would CN have showed more live-action stuff and become more like Nickelodeon?" There's no way to tell, and I can certainly see how, if it had been wildly successful, the execs could've said "Okay then let's expand this brand further!" At the very least, I have nothing against its premise or how it was executed, since again, CN was still showing cartoons way more often than not.
Food is food. But animation is not live action. See what I mean?
Hmm, not really. Because "food" is pretty subjective too. Some cultures think grasshoppers and grubs are food. We don't. We think of cows and chickens as food but if there was some crazy ultra-vegan civilization somewhere they might be shocked that we thought of those animals as food.
But even putting "animation" in an overly broad sense doesn't work. Heavy Metal is vastly different from Spongebob Squarepants, and both of those are very different from Looney Tunes, and none of those are quite like the Flintstones.
This is a big reason why some people were very against Cartoon Network having anime, because anime feels and looks vastly different from American cartoons. This is why they were like "It's CARTOON Network not ANIME Network," and there are people out there who make a distinction between anime and cartoons, just like they make a distinction between manga and comics like X-Men. Whether that's right or not, is a matter of opinion I guess, but it happens.
Besides there are plenty of really "cartoony" live-action shows, like those Japanese game shows, or the Three Stooges. There are also a lot of "live-actiony" cartoon shows (though those tend to be anime).