Welcome uno1971!
Like none said, the GOUT (or 2006 bonus DVDs) are very often referred to as the "original theatrical versions", but they're simply a DVD version of the 1993 Laserdiscs, which while being the original versions without CGI additions, does not represent the original look of the films.
The 1993 versions have too much red and too little other colors, are too muted in the contrast, and has lots of problems like smearing due to the noise reduction which was applied to it when they made the Laserdiscs. The original prints showed in theatres back in the day were colorful, balanced and much more lifelike.
There's lots of nice restoration projects going on here though which are aimed for a better "true" original experience. You might want to look at Harmy's Despecialized Edition, negative1's upcoming 35mm release, or mine/dark_jedi's upcoming Project Blu V2.
Most of the stuff on here can be found on myspleen.org where you'll need an invite to become a member. I have some invites left so feel free to send a pm. :)