[notpushkin]

ANSI/ISO is the main difference I think.

Now, Japanese keyboard [1] is a whole other beast, but for the most part layouts customizing ANSI and ISO blanks should work just fine.

[1]: https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2F...

[numpad0]

Yeah, there are mostly only ANSI, ISO, and JIS physical layout in this world, stamped differently to suit needs. JIS is only ever used in Japanese so just blank ANSI and ISO should cover everything(emphasis on should; corrections are welcome).