No such thing as a daft question.
So when you swap between ANSI and ISO layouts typically there are a couple of switch positions that change as well as stabilizer positions change.
So for ISO the pipe/slash switch is removed and is placed by the left shift which is split to accommodate that smaller key cap.
Here is a great explanation of the difference.
On some mechanical keyboard forums recently, I’ve noticed that some people are asking for ISO keyboards or ANSI keyboards. We did some research, and in this article, we’ll tell you
switchandclick.com