blockchain itself is not a "software" it is a database. as the name suggests it is "a chain of blocks" which means blocks of data that each is linked to the previous one like a chain.
considering the fact that a very large percentage of altcoins have copied bitcoin, their blockchains are exactly the same.
I don't know whether we can have a site that has all stats on total hashrates of each cryptocurrency network. But even without such a site, I believe that the total hashrates on bitcoin network makes it totally different from any other cryptocurrency (altcoins). It is the fact that altcoins might never pass through to beat bitcoin. In the crazy years of 2017 and 2018, people talked about the flippening of Ethereum or Ripple that have never happened and even in such period, I doubt that their networks' total hashrates were higher than bitcoin network's hashrates.