Help IDing a record: Rez/Why Why Why (unlabeled)

[greatscott]

Hey all,

I'm guessing it's just an unofficial pressing of some sort, but I picked up a record from JP that had "Underworld Promo" scrawled on a generic white sleeve. The record itself is a super dark marbled pink (almost looks black unless you hold it up to light). The labels on both sides are just blank. The only etchings on each side just say "A-1" and "B-1."

The closest thing I can find might be this: https://www.discogs.com/Underworld-R.../release/98177

But the descriptions/photo don't exactly match up. I'm guessing it's not official / some other uncatalogued bootleg that should be entered into discogs?

Anyone seen or heard of this version?

Best!