No, I wouldn't say that they will all be treated the same way. I guess it depends on the proof itself. If the proof is really novel and provides some kind of idea that can be generalized, then it might be interesting to professionals. Or when the proof illustrates some kind of abstract theory.
A famous example is the insolvability of the quintic. This was originally proven by Abel and Ruffini. But later, Galois proved it using the methods of (what is now called) Galois theory. From a certain point of view, the theorem was already proven. But the proof Galois gave is very intricate and beautiful. Furthermore, it gives exactly a criterium of when a polynomial can be solved or not. And the same method can be generalized to other settings as well (such as integration theory). Finally, Galois theory is one of the most elegant mathematics known to man! Despite Galois theory not really proving anything novel, it is still one of the most important theories in mathematics out there.
If you are interested in Abel's theorem, then I highly recommend the following book:
https://www.amazon.com/dp/1402021860/?tag=pfamazon01-20
It is suitable for high school students who are interested in higher level math. It introduces elegant theories such as groups and Riemann surfaces and it culminates with Abel's theorem.
