User blog comment:Miskos3/Fairy Tail Episode 248: Tartaros arc: Attack of the Celestials, Review/@comment-7418318-20150829093931/@comment-2214433-20150829101609

They are actually remixed soundtracks that are put up as new ones into the latest volume. I'm sure the CSK one was included in OST Vol 5. One of the Sting and Rogue soundtracks as well, or the Ur one.