The keyboards pictured on the keyboard layout cards, key cap labels and in the manual are representations of the ISO international keyboard. This keyboard is not sold in the US. However, it is widely used outside the US. These keyboard layouts will only have minor differences on US keyboards.
Depending on which keyboard is in use, some characters may vary from the included keyboard layout charts. For instance, when you are using the Russian Normal layout with an Apple Extended Keyboard, the square bracket character appears to the left of the number 1 key (under the Escape key), not as shown on the printed layouts.
One KeyCaps feature is the ability to hold down the Command key (in any of the Cyrillic layouts) and see the QWERTY layout (AZERTY or QWERTZ for the French or German transliterations). This is very helpful for faster keymapping recognition without having to look down at the physical keyboard.