The blue and white Shiranui is referred to as "Nine-Four Second", and serves as the testbed for the XFJ project. It begins life as a standard Shiranui Type-1C, which is then further modified with more powerful engines as a result of cross pollination from the ACTV Eagle.
A testbed aircraft is not a prototype; rather it is an aircraft that is modified to resemble the future prototype in certain respects, and is used for data collection and tests - hence testbed.
The red and white Shiranui on the other hand, is the new Shiranui Niigata (Shiranui Type-2) prototype, which IIRC is a new airframe that incorporates the lessons learned from the 94 Second testbed.
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