Island Imperial Pigeon?

made in Plzen Zoo, behind the scenes
There are multiple Ducula species kept there, some of which look very similar.

I think this one could be either Sunda Green Imperial-Pigeon (Ducula aenea aenea) or Island Imperial-pigeon (Ducula pistrinaria)

In the heart of Transylvania
In the Vampire Hall of Fame, yeah
There's not a vampire zanier than


(sorry, I'm in a puckish mood and couldn't resist)

I'm inclined to suspect it might be the Island Imperial-pigeon - I think the rufous patch on the back of the head would be visible in this shot were it Sunda Green.

I think the red patch is only present within the Ducula aenea paulina subspecies.

It think this should be the Island Imperial-pigeon/Ducula pistrinaria, as I did not see them anywhere in the public part of the zoo while I did see the D.a.aenae in one of the aviaries on the high part of the zoo. However, this could just be another aenea in which case the Ducula pistrinaria is no longer kept. As long as I am not able to tell them apart visually, I can't be sure.