I believe that's right. I've had my 02 W208 from new; it came with two identical "normal" keys, and no emergency key.
The normal keys have three buttons: lock, unlock & boot release, and the lock/unlock also controls the windows, via infra-red, when held down. They have a removable metal piece, not used for normal operation, which I've assumed will unlock the doors but not operate the ignition (having no electronics).