There are probably two species of animals being identified as Gonodactylus smithii. Those that are dark green, fairly solid in color and come from Australia, Indonesia, etc. are probably G. smithii.. Those that come from the central Pacific - Fiji, Guam, etc. may be a different species. The have a lot more mottling to the body color with large light patches. The meral spot also seems a bit more maroon to me. Until we do the genetics, we probably won't know for sure how many species there are in this group.
Roy