These Patch 9.1.5 datamined sets use the enhanced Mythic/Elite PvP versions, which come with additional details. This has led players to speculate they are from Legion Mythics during Timewalking.
You can check out the original colors from Legion in our in our Tier 20 armor post:
Interested in other Tier 20 recolors coming in Patch 9.1.5! We are datamining all the sets:
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