I am pretty sure that if you have reached the point that you are ordering a laptop online from a brand unknown to the general public, it means you are past the point you need the actual physical keys to match your keyboard layout on your OS settings. You could just have blank keys.
To be fair, some international keyboard layouts actually have variations of key shapes and locations. The shape of the Enter key and the cluster around it is the main example. So it's more than just the labels.
I own both ISO and ANSI keyboards on different laptops and use the same software keymap. I don't think it is such an important factor as I switch from one to another without thinking about it.
