If two yellow BattlEye servers are merged they will remain yellow. I will give you a couple of examples:
Although it may seem confusing due to them being merged and "new worlds" they originally weren't new worlds.
green symbolizes the world has been protected by BattlEye since the creation of the world
yellow symbolizes the world has been protected with BattlEye since a certain date after the worlds creation.
When you look at the world list on Tibia's website and you hover over the BattlEye symbols it will remind you what it means. Also, to know when a world is created click on the world on the world list and look where it says creation date. If you're interested in a summarized list of worlds, BattlEye type, creation and all you can visit Tibia Wiki: BattlEye
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