I think the OP meant the other route, the former part of the Nemesangele battle.
Probably, this will be included in the physical CD set original sound track vol. 9, set on April 28th release in JP
Guessing from the list, disc 1 track 10 "Dive into Constellated Sea - Sector 3" is the song on CD, "艦隊迎撃戦「セクター3」" (The Armada of Annihilation: Interception - Sector 3) is the music disk. As an item that appeared as item code with a physical product in JP, maybe we'll have an access to this in global through some AC spending way.
The other song is titled "Vacuity" in JP I guess. If I understand right, there's no music disc for it even in JP yet.
EDIT: Yeah, these two are really good tracks. I want these for my list too