Yes, it's the same type of key that's used for other versions of these games. I'm not 100% sure if it's an _offline_ key since both games do connect to the developer's website to obtain updates, I never tried to enter the key while I was offline.
This is what I've read on their official website that gave me that impression:
We've got a simple license key (which turns the trial version into the full version), but that's it. No need to contact our servers during install, no hidden drivers, no encryption, or install limits.