I think you refer to Mike's statement about Earthquake. He said on the podcast (here at 1h10) that the film score recording of Earthquake, which had never been released before the LLL set, was used in the special features for the Shout Factory Blu-Ray that came out earlier in 2019. Nobody seems to have noticed it but that would have been a great clue an expanded release was coming out.
The Dracula OST digital release is definitely the new MM master. We also know that The Fury digital release comes from the same master pressed on the LLL release, but this one wasn't done by Mike iirc.