When I decided to purchase Toshiba Z830, I specially noticed at photos that the keyboard was good for me (wide Enter, Left Shift, Backspace), you can query it at images.google.com, on most photos they're all wide. When I finally bought it (Z830-A2S), the keyboard was different, the Enter is narrow and the left Shift is "split" into Shift and backslash keys (probably 5% of photos at images.google.com).

Is it normal for manufacturers to change this during the production cycle or this can be variations from different contractors? But the main point, is it possible to determine this from the full model name or somewhere else without visiting a store?