ANSI vs ISO Layout
104/87-key ANSI layout is commonly used in US, Canada, and Australia (US QWERTY layout).
105/88-key ISO layout is commonly used in European countries and is available in various language layouts such as UK, German, Swedish, French, etc.
ANSI layout
The red keys illustrate the keys that differ from ISO layout.
ISO layout
The red keys illustrate the keys that differ from ANSI layout.