In this pic we see the standard Z06 (Stage 1) -- on the right. Note its front splitter does not have any vertical winglets; it is smaller to balance front and rear downforce with the Stage 1's standard Z-51 spoiler. Also noteable, in the picture of the rear fascia of the Stage 1, Z06 in this thread's first post, is that the lower fascia air-ducting vents appear to be narrower. Might they be the same as those in the StingRay?
As the Z06 is going through ten more months of calibrations, it is possible we will see "fine tuning adjustments" to some the components shown in this thread's pictures.