Really? I'm reading the Davis DVD breakdown of every home video release of Star Wars in every format and it says the widescreen transfers that came BEFORE the the Defnitive Collection were the same as the Japanese Special Collection. In Jedi's case, it's why widescreen versions of Jedi, both the VHS and the american laserdisc, were still upshifted before the definitive fixed it.
I'm pretty sure I'm misreading it somewhere, but I'm hoping you can clarify a little better.