Well unless someone resprayed it Midnight Purple I then no R34's ever came in that colour.
All factory purple R34 GTR's are either Midnight Purple Pearl II (series 1 only, only 400 made) or Midnight Purple Pearl III (series 2 only, not sure how many made).
So if I had to guess I'd say its 95% a Midnight Purple Pearl II. Since its a V-Spec.