Many of those buttons look like they'd be horrible to actually use. They give you same sized arrow keys, but tiny tilde/right brace/slash? I can see I wouldn't be doing much development on it.
Most of the space difference seems to come to the smaller space bar. Tab, caps, and shift on left and delete, return, and shift on right. And the brackets, plus, and minus.
Other than that, the actual letters seem identical.