I should have checked this before I replied above, but the 1967 and 1968 AIM's show the Z21 (fronts) as 3893829 and 3893830. For Z22 it says "See RPO Z21". This tells me that ALL 1967 and 1968 Camaros ordered with Z21 or Z22 got the same exact molding.
Yes, they were replace in SERVICE by two different applications, depending on if the car had Z21 or Z22 (Without RS or With RS), but according to the AIM's, for production, there was only one set for the fronts.
Ed