In a snapshot testing world, I have noticed that Dried Ghasts always face north in world generation, when I observed 10 of them.
To reproduce, locate any Dried Ghast in the nether. This is my seed 1055034075614542662 and you can find 4 of them nearby each other at around -387 46 -568.
Expected Results:
Dried Ghasts are either rotated specifically for each nether fossil, or rotated randomly in world generation.
Observed Results:
Dried Ghasts always face north in world generation.
Can confirm, this is particularly noticeable when you can't see the face because it's against the bone block.