[A] Macabre Joke and Double Murder in the [Rue] Morgue: Two translations in Australian reprint editions

I've often wondered about the Spanish horror material published in Gredown comics - how it was sourced, where the material originally appeared, how it was translated. I assumed the translations were done in association with the international distributor of the material. However, what I didn't realise is that multiple translations of the same material existed, and indeed that the variants were published in Australia.

For example, Gredown's Vampire Havoc contains the story A Macabre Joke:

This story also appears in Gredown's Bite of the Vampire, retitled Macabre Joke:

It is not only retitled but it is a different and, in many ways, a better translation - the expression is more fluent, and the font is more professional. And note the shape and positioning of the speech balloons are unaltered in the two versions. 

Note also the club sign in the final panel of A Macabre Joke:

The Bite of the Vampire version has been translated:

Unfortunately I have not been able to find traces of the original edition of this story.

However, I have found another instance of a pair of translations of the same story in Australian reprint editions.

Double Murder in the Morgue appeared in Gredown's Weird Tales of the Macabre #1, 1976:

This was recycled by Gredown a few years later in Terror Tales Album:

A different translation of this story appeared in Murray Comics' one-off Ghostly Haunts as Double Murder in the Rue Morgue:

There is no editorial information on any of these three printings designating a writer, artist, translator or publishing origin, but it is clearly a story of Spanish origin, courtesy of the double exclamation marks. As per [A] Macabre Joke, the panel, text box and speech balloon shapes are unaltered.

There must be more of these multiple translations lurking in Australian reprints. The variable interpretations of the titles contributes to the difficulty in tracking the source material. I'd love to find out more about the sources and the translators.

Update 20 May 2021:

I have found an earlier printing of Macabre Joke in Gredown's Planet of the Vampires #5. It appears to be an earlier version of the Bite of the Vampire translation:

There are differences between this version and the later version. For example, "My dear" in the third panel of the splash page above was altered to "Old chap" in the Bite of the Vampire version, and  extra/inverted exclamation mark for Jonathan in the first panel, surely based on the original Spanish printing, is omitted in the second verison. And, on the final page, the Ja Ja Ja exclamation is altered to Ha Ha Ha along with FIN altered to END in the final panel.

This version also includes the original creator credits - Script: M.Yanez and Art: M.G. Esteban