Lenovo KU-1619 keyboard - flat
Lenovo SK-8827 keyboard -
Lenovo SK-8825 keyboard - ??  - blue/grey enter and return keys, keypad divide symbol, notched back

Lenovo FRU:00XH726

Dell SK3205 keyboard - raked - card reader
Dell L100 - raked? - 

KB813 is model number for "flat" Dell keyboard.
Seems to be same model number regardless of layout.