Thirteen pupils of a year 11 French class at Bayfield High School were given samples of the Moro of old, made in Dunedin, and the replacement, made in Melbourne, that reached the shelves yesterday.
Five, including teacher Christine Gardner, managed to pick the Dunedin-made bar from the Australian version.
Some considered the new bar softer and sweeter.
The majority of a dozen ODT staff supported that finding.
Only two were unable to say which was the old and which was the new.
Cadbury is seeking feedback from the public.
A company spokesman said the Australian factory has the means to "refine and develop" the way the Moro is made.
Moro is Cadbury's biggest-selling bar in New Zealand and was designed in Dunedin in 1968.
