The trigger in the top pic is a newer style trigger that I believe you'll find in most DA/SA models. The trigger in the bottom pic is the older style. Most people including myself prefer the older style. I personally find the newer style very uncomfortable, and I've had a couple pros tell me they felt the same way. I wish CZ would do away with that new version.
I pretty much only shoot single action CZs now, so I guess it's not a huge deal to me anyway though.