Okay, so I didn't buy my Superunknown's from Initium, I got them from ebay a long while back now, so I can't be sure on the exact named color from that perspective.
Time for a bit of investigating!!
So looking at what Initium have available now, I think my frames tortoise pattern is closer to the RX tortoise version, if not exactly that. Bear in mind Initium's product shot of their RX tortoise looks really bright.
Mine...
View attachment 1633837 View attachment 1633846
Initium's RX tortoise (really bright product photo)...
View attachment 1633838
Initium's RX tortoise (looking a lot darker in standard lighting)...Looking closely, I think the above pair used in the product picture are the middle pair in this picture...
View attachment 1633840
Notice how much variation there is in the tortoise pattern between the 5 RX pairs, with the middle pair having that large streak of amber right across the bridge, compared to the more subtle patterns of the other 4 pairs.
I think the dark tortoise are too dark and don't have much amber or amber streaks in them (also they are supplied with gradient lenses

)...
View attachment 1633843 View attachment 1633844
As product shots, these will probably be even darker in reality and when worn.
Notice how darker my frames look here just folded flat...
View attachment 1633845
Yet this pic was taken at exactly the same time...
View attachment 1633853
So I've took some more screenshots from IM2 and IMHO they aren't the dark tortoise...
View attachment 1633847 View attachment 1633848 View attachment 1633849
Note the pattern of those really light amber sections...
View attachment 1633855 View attachment 1633858
The 2 screenshots below show the light amber tortoise pattern
throughout the frame quite well...
View attachment 1633850 View attachment 1633851
With the clincher IMO being this picture...
View attachment 1633852
...Which shows the pattern as random lines of streaks of amber tortoise, as opposed to the subdued much darker "non streak" pattern of the dark tortoise versions.
As with all tortoise frames, the amount of light tortoise you get is always pot luck!!
...Ooh, just noticed this too, it looks like Initium have used a gunmetal temple detail on both the later version RX tortoise and dark tortoise, the same gunmetal detail as seen on the black frame version...
View attachment 1633865 View attachment 1633866 View attachment 1633867
The earlier run movie versions have the "shiny silver" temple details, which on the left side only, is etched with "Ini+ium" and also they have the thinner shape temple tips...
View attachment 1633869 View attachment 1633870 View attachment 1633873
I know this was a bit long-winded but I hope it helps.
The extra investigating ironed out a few niggling doubts I had too!!