Found some info on Mellon Collie Demo's (IIE: pscs87).
https://www.discogs.com/Smashing-Pum...elease/5639206
It appears to have the same 18 tracks as Billy's Home Demos.
https://www.discogs.com/Smashing-Pum...elease/5227345
Edit: Looks like two different "labels" releasing the same bootleg 3 years apart.