Haven't read anything about the chance of both mounts dropping EoE or if it was even possible.
Myself and my friend went EoE for the 2nd time
Myself after Azure and Telstar after Blue so no clashing would happen and to our suprise both dropped.
I pretty sure this is a really really small chance and that this will be the luckiest thing to happen to us in WoW ever.
v--- Picture so it did happen and wishing you all the best in your hunt