It's not compressed or anything, it's just full-fledged cropped 1.33:1 fullscreen.
And this version has the UPA opening with the "MONSTER ZERO" title card. I don't have Simitar's disc, but did the fullscreen version on the flipside of that one have that title card or the "Godzilla vs." one? Because if it had the "Monster Zero" card, then this AOL version could simply be sourced from that.
