Basically they are pretty much one and the same but I have already proven half of it. However here are the two theories.
Theory 1: The chest in the darkness can be looted again for the new shards after patch.
I have actually proven this one to be true, but now the second one I will have to ask others for help with. I want to know if the loot tables that were for the chest to the deathsinger will carry over from the chest. In this I mean that the Deathsinger will have no drops for those that got loot from the chest or if people could possibly get double drops this way before the reset,
Please, if anyone can let me know this I would greatly appreciate it.
-
if you already beat the raid including deathsinger then no you will not get a reward. BUT if you skipped deathsinger and went straight to a crota checkpoint then you will get a reward from deathsinger.