Is this an official game or a mod of the FM-Towns Japanese release?

Many years ago a game called Zak McKracken and the Alien Mindbenders was released on the PC. Here is a screenshot of the PC version of the game:

A 256 colour version was released on the FM Towns machine for the Japanese market:

As well as better graphics, the game also had all the characters with anime style eyes:

However, I have come across screenshots and videos of an English version of the FM Towns game (without the anime eyes). For example:

I cannot work out if the English version is an unofficial modded version or a legitimate release.

Does anyone know if the 256 colour, English, non-anime version was a "real" release of the game?

RE: GOG release

I can see that an English 256 colour was released by GOG in Mar 2015:

But there are earlier sources such as this 2008 video on youtube:

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