Giant Superman Album: Where did that Superman cover image originally appear...?

Here's something I think will fascinate collectors of KG Murray comics. This panel appears in the tabloid-sized Superman vs. The Amazing Spider-Man:

It's an auspicious moment for superhero fans in general, but it's also of note for readers of the Giant Superman Album series- the Superman figure was modified for use on a few issues of this series, beginning with Giant Superman Album #33:

It also appeared on the covers of Giant Superman Album #35, #38 and #40.

There was a tradition of such Australian made covers in the 1970's - an image of Superman would be pulled from an issue originally published by DC Comics and used to introduce the contents of the issues via panels related to some of the stories contained within. All of these Superman images have been identified over the years, and are catalogued on AusReprints. However, this image has proved particularly elusive, and its source been bugging me for years, so you can imagine I'm quite chuffed to have solved this mystery.

It begs another question - if KG Murray had access to this image, does this mean they also had rights to the Superman vs. The Amazing Spider-Man issue? Presumably so. It's a shame a local edition of this issue doesn't exist. If it did, it might have been a regular-sized issue printed in black and white, like the Batman vs. The Incredible Hulk published by Federal.