Based on some googling it sounds like Laser Pacific did a Raiders restoration under Spielberg's supervision, which I assume is the Wowow version. Then Laser Pacific was bought by Technicolor, who then re-colored what I assume is the same scan for the blu ray. That makes sense to me, I don't think the blu is a different scan. And Technicolor is listed on the blu ray. The question is why did they change the color after creating an already excellent restoration? The only thing I can think of is to "modernize" the look to match Crystal Skull and somehow appeal to a modern audience. It must have been done late in the game because the trailer released to promote the blu-ray set has a restoration demo featuring the Laser Pacific color, not what was actually released on blu.