I found this out (early) last night at Hastings.
Deadly Embrace and Murder Weapon appear to be just straight VHS transfers.
Nightmare Sisters is missing the 9 minutes of outtakes/bloopers, stills galleries, and the other two audio commentaries that were included on the old Retromedia DVD. You gain the new audio commentary on this disc. The transfer on the new DVD looks to be taken from the same source as the old release...perhaps just a tiny bit more compressed.
David DeCoteau joins Linnea on the three audio commentaries.
"The good thing about science is that it's true whether or not you believe in it." - Neil deGrasse Tyson