It's fairly easy to take the Casio Exilim EX-S10 apart. You'll need a small #000 precision philips screwdriver to remove it's miniature screws. Other than that, ...
As indicated by their name, they are almost identical. They both offer zoom function in the 70mm to 200mm range, f/2.8 wide-open aperture for low-light work, ...
The lens is very solid and sturdy, yet not very heavy. Focus ring has full throw, rather than the very short throws on zoom lens, which may be why AF is slow.