Minecraft Enderman won't trigger?

With a pumpkin on your head you can prevent an Enderman from being triggered when you look him in the face. Is that also possible with a dragon or a zombie head?

No, only with a pumpkin.

No, that is only possible if you look at the Enderman with a pumpkin on his head or through a glass. Other mob heads halve the distance at which the corresponding monster notices you

And through glass

OK thank you