What is the difference between Apple MB110LB/B and Apple MB110Z/B keyboards
One seems to be the “USA” keyboard, the other one is the “International English” keyboard, you can see pictures of them (click to zoom in) on the Apple Store sites:

MB110LB/B: http://store.apple.com/uk/product/MB110LB/B/apple-keyboard-with-numeric-keypad

MB110Z/B: http://store.apple.com/uk/product/MB110Z/B/apple-keyboard-with-numeric-keypad-international-english

Both have a basic QWERTY layout, but have some differences in the other keys. The layout around the ‘return’ key and of the key itself differs a little. The left shift key is shorter on the International English keyboard, and it has an extra key for ‘§’ and ‘±’ (below the ‘esc’ key) which doesn't appear at all on the USA keyboard. Finally, the USA keyboard uses words on some keys like ‘tab’ and ‘shift’ where the International English one use images.

I'm not sure if there's any difference between the “MB110LB/B” and “MB110LL/B” keyboards, the latter one is more clearly labeled “USA”:

MB110LL/B: http://store.apple.com/us/product/MB110LL/B/apple-keyboard-with-numeric-keypad-english-usa

Based on the Logitech keyboard of which you showed a picture, I assume you want the “USA” one.