They all have the same tech. The only Tech that is different it's bitcoins. They all run eth no i can send matic to a ethereum address. Its all the same tech just different brand names
Discussion
i think you are talking about evm (which unfortunately nothing but bunches of copycats, yes as you said above. optimism, bnbchain, arbitrum, aurora, polygon are all the same, just different chain id).
but no, there are many other techs than evm.