No they are not.
Here a link to the One-Eyed Mask on Light.gg: https://light.gg/db/items/3918600864/one-eyed-mask/
Check out all the different perks it can roll with. I count 35 different perks.
um, no they are not. Here two different YouTube clips from people who got lucky and had a One-Eyed Mask dropped:
1. https://www.youtube.com/watch?v=Ombm9cnsGKY
2. https://www.youtube.com/watch?v=hIKxQ1sl1gQ
In the first video go to 0:34 to view the perks and in the second video go to 1:27.
In both clips the rolls are different.
I’ve gotten two different rolls of Ashen Wake, one the same as Xurs this week and one that I got between the 2.0 update and Forsaken with fusion rifle targeting, heavy ammo finder and some others - three options in the first slot, two in the second.
Different rolls also kinda destroys the argument for them being such rare to non-existent drops tbh.