Jeez, you're comparing apples and brussel sprouts...
The FZR400 was one of those bikes mfg's periodically import from other markets, and they took a bath on it. It's tiny, cramped and best used on extreme backroads or racetracks. It's main claim to fame was it's phenomenal handling (for it's day) and the fact that it was relatively easy to shoehorn the FZR600 motor into it. Two-up? Only if you're both small and/or masochists.
And these two look and sound like some squid's own handiwork. No titles? 'race track fairings'? A Kawasaki 500cc twin motor squeezed into one? Homemade rustoleum paintjobs?
I mean, I'm all for project bikes and all, but all that for two grand?? Not me, brother.
Good luck with it, whichever way you go.