Even with the blue cast, I'm skeptical about that theory. I just cannot see a Latin American TV station doing an in-camera pan-and-scan job on a 35mm print. I doubt that the majority of them even had 35mm film-to-tape equipment - from what I can gather, they would receive film material on 16mm well into the 80s.

If they were running from film and not from video, I'm almost positive that Central and South American stations would have received flat 16mm prints (the kind that used to be shown on airlines - the ITV broadcast seems to have been a flat print, judging by the presence of jump cuts in place of pans). And since Star Wars was not running on TV until the 80s, they may well have just received a copy of the official video transfer on tape, but with the Spanish dub.

-1, did you take pictures of the leaders when you still had the print? Did the prints still have those paper rings with the distributor, reel number, etc. on them?