Les, might be worth contacting Anthony via his website if you're still looking for a definitive answer:
http://www.thewanderlust.net/blog/Anthony used to be a forumite & compiled some useful info in the very early days of the forum. He used to have a set of pages called Anthony's white Mazda MX5 which I saved some years ago - in it under Australian MX5s he lists Mariner Blue for 1993. I believe he also provided the stats for the number & colours of Clubmans, so he may have had got the info from Mazda Aust.
Juffa, I also saved that old past models Mazda Aust page you refer to, but unfortunately it's only got info on limited editions & not standard colours & corresponding year. Of course I may have saved it before or after it was modified from the version you saw.