Chromeos version: Is it based on the hardware?

Hi,

I have a doubt regarding Chromeos versions.

Is there only one version of Chromeos released or the version depends on the hardware you are running?
I mean if you device is supported, you get the same Chromeos version if you have a Chromebook Plus V2 (with 4 GB RAM) or a Pixelbook Go (with 16 GB of RAM).

Thank you!