Just to give you an example of whats doing here, probably the same scenario in NZ.
The ones that were imported here are just called sulphur crested.{Once again an old school name}
Having seen alot through the lfs etc, some have the full blaze through the head, some don't. Over here it is just a case of some are not of as good a quality as others. Its like so many species, especially the old lines, electric yellows, fronnies etc...... lithos {ie;sulphur crested lineage} have been around for a good number of years therefore variances in quality exist.
As a guess, if those in NZ were imported without a variant, they be the same lines as those here in Aussie.{ came via Asia}
The thing you have to watch is that litho's & electric blues cross easily. eg; If you ever see electric blues with the utaka spots, avoid like the plague.
Frenchy