1. Sideswipe
Confirmed: The same ugly paintjob. No silver paint
2. Crankcase
Looks the same. It's funny it seems that no one is willing to buy him in case he turns out to have his middle finger lopped off as well. So I can't say anything about whether he has his finger or not.
3. Deluxes generally
They look like they have the same paintjob, although my Roadbuster this time has a much better paint application than the Hasbro ones I've seen in store. Otherwise the only difference seems to be this collector card encased with each

4. Voyager Prime
I can't say if he looks very much different from the Hasbro version

I think some people were wondering about the colour of his blade. His blade is translucent orange.

His trailer seems pretty much good for nothing except as a collector's case of all the Mechtech weapons.

Again, it seems to me that just as with the ROTFs, the only thing different is some Japanese writing and labelling on the Takara versions. Except for Voyager Prime who's sufficiently different, my feeling is don't waste your money thinking you're getting something different or special.