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I always assumed the Z06 version was for the different (higher) red-line marking on the tach display.
When I installed a HUD on my 2001 Z06 I first had a used non-Z06 HUD and it didn't work (no lights). I was told it was a good HUD. When I got another it was also used but for a Z06 and it worked fine. I still assume my first HUD was bad and the HUDs are interchangeable, and the only difference is the red-line markings. But I have not had anyone that could confirm that for sure.