Yep. the 2.0L engine Duratec is a Mazda engine, whereas the lower capacity engines ford badge as 'Duratec' are actually re-named Zetec SE engines. The Fiesta ST cams are chain driven, not belt, yeah.
Actually that's the first think I looked at when reading the Fiesta ST specs before ordering as I was coming from a Cosworth with a broken cam belt!!! I did not want anything with a belt any more, at least for a while...