Pearl gold vs flat dark gold I've ordered 4 "pearl gold" pieces of part 92690 on BrickLink. Unfortunately, the seller had to adjust the order as he only had 3 such pieces, he proposed adding two more in "flat dark gold" in exchange, which I agreed to.

However, searching the BrickLink database, no such piece exists in flat dark gold in any set (the seller acknowledged that and he has no other explanation).

These are the pieces (pearl gold on the left, flat dark gold on the right):



My question: What is the origin of the flat dark gold pieces? Is this discoloring because of age? Or is the BrickLink database in error? Note that, at the time of writing this, 70 sellers are offering this piece in flat dark gold.
There has been a slight change to the Pearl Gold/Warm Gold color recently that might explain the difference in color between those pieces. See this article on Reddit. Perhaps the right two “Flat Dark Gold” pieces are the newer recolor of Pearl Gold? I recall Jang from JangBricks talking about this as well in his videos.

Here is the picture from the Reddit article showing the new Pearl Gold on the top, and the old on the bottom.