The Shelby American CSX series has direct lineage to the original, no other "cobra variant" can make that claim, hence the proper SAAC distinction.
Following the FIA World Manufacturing Championship in 1965, Shelby American began work on upgrading our signature roadster design. In 1966 we debuted the 427 S/C, our most powerful high-performance roadster, for street and competition (S/C). We developed independent suspension, fortified the frame to handle the increase in torque, and made adjustments to the body to set it apart from our other models. We resumed production of the Cobra 427 S/C (CSX4000-series) in 1997 and they’re available today in aluminum or fiberglass.
Shelby American Inc. - 2012 GT350
You may not like it, but the fact remains your kit car replica does not equal a CSX in the eyes of SAAC, nor should it. If that bothers you then you should have bought a CSX.