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Does anybody know what was added/modified in the Japanese special editions of the PS2 Underground games? I can get them both cheap at a local import store, but I can't find much info on what was changed from the initial releases.

Did you read this?
Sha_Do is a special retail release of Need for Speed: Underground 2 made available in Japan on July 14, 2005 under the "EA Best Hits" label.
The additional subtitle is in reference to the artist Sha_Do, whom at the time of the game's release, designed liveries for Art Factory Graphics[1].

It was made available for PlayStation 2 as a boxed retail game, but was localised with an aimed release within the Japanese market. Changes include Japanese dubbing, localised car model branding, and new Sha_Do vinyls under the Art Factory brand in place of contest vinyls.

And this?

J-Tune is a special retail release of Need for Speed: Underground made available in Japan on June 24, 2004 under the "EA Best Hits" label.
It was made available for PlayStation 2 as a boxed retail game, but was localised with an aimed release within the Japanese market.

Changes include Japanese dubbing, localised car model branding, and seven exclusive Art Factory vinyls which replace some of the Unique vinyls.