x86 is the architecture, amd64 is an extention on that architecture so it’s still x86 just with an instruction set extension that allows for native 64 bit computing.

x86 was designed to be nearly fully backwards compatible back to the i386 or even the 8086 so whatever code that could run on those CPUs would work on modern “amd64” CPUs.

Pretty much x86 is a snowball rolling down a hill. It keeps picking up new things and growing as time goes on but the core of it will always be the same.

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Comrades fit better in this phrase but it makes you sound like a communist which is either a positive or negative depending on who you’re saying it to.