I still have a hard time thinking its Fiesta that guitar is very likely the same guitar as used at Roseland as Kurt did switch out the tortoise guard for white pearl and had a mini humbucker in the bridge I believe before deciding to use a full JB and it very well may be this Mustang here.

Heres a still shot of the Mustang we are talking about

Also as far as I know Kurt's Mustangs were regular stock Japanese made reissues which were modified with a Tom and full sized JB, while its not impossible for him to have gotten a fiesta red one if he wanted I don't think Kurt would have gone out of his way to get a guitar custom finished in another variety of red.