Now that Shadar-Kai are officially elves in 5e D&D, is there an official source or even semi-official (WOTC tweets, Designer blogs / podcasts / videos, Unearthed Arcana, etc.) that links these pale neutral-ish elves with the pale, neutral-ish Shadow Elves from the known world aka Mystara.
I have so far not been able to find even semi-official confirmation, especially since Mystara is seldom officially mentioned in a 5e context. But it really seems like they have many points of overlap.
Personally, I intend to make them one and the same.