Specifically on Flisch's map, this one:
I've got the associated changelog to keep us current:
-Added Seychelles (To the island that was formerly the Canaries)
-Subsequently moved the Canaries to an island on the atlantic coast of africa (which makes more sense anyway)
-Added "Various polynesian islands" to the australasian sea. I'm too lazy to label every one of those. You can figure it out.
I mean, the fauna and flora should be fairly homogenic anyway.
-Added a little strip of Middle Europe to separate Iberia from Caucasus. This also means that Middle Europe now touches the mediterranean coast. Imagine those parts to equal Italy and Greece in terms of ecozone.
Ovi had a suggestion last we all spoke.
During research I found that Ascension Island is wetter than St. Helena, and they aren't terribly far apart (they are the ceneters for the top two circle in >this map<).
As such I think would should count that island chain as "St. Helena and Ascension" as far as ecozone equivalency is concerned.