How do I differentiate between different keyboards?

I want to be able to differentiate between several keyboards for macro purposes, such that, for example, pressing the x key on one keyboard does something different than pressing the x key on a different keyboard.

I tried to search for videos of how to do this on youtube, but most of them were for windows.

I'm thinking that I would use a program that, when a key is detected, would execute an AutoKey script depending on the key which is pressed and the keyboard the stroke is coming from.

How can I do this?