Yery interesting! Thats leads me to the question which one of these tracks were shipped for the audio dubbing in foreign countries? The German Dubbing for example featured the “Close the blast doors!” line and a music cue during the Dianoga attack from the get-go. (The Dianoga music was later reused for the extended Mos Eisley scene in the ANH Special Edition.)
AFAICT the Dionaga music was added (accidentally?) in the 95 THX releases in several European markets. It’s there on the Spanish THX release as well, but was not on any prior Spanish home video release.