The keys on the bottom row of the AEKII are not all the same size. The Option keys are smaller than the Control and Command keys. The layout of the numeric keypad is also different, with an extra = key and a small + key, with '-' shifted down one step.
Some AEKIIs are also weird in that the left Shift, Caps lock, Tab and ~ are 1/4" wider, while Backspace, Enter and Shift are 1/4" less wide. The alphanumeric section is shifted 1/4" to the right!
The key caps are also weird in that they bottom edge is aligned to the curvature of the case's lid. They might therefore look quite weird on a keyboard with a flat case.