Match each retained plate to its actual finish identity before changing labels. Then quality can establish accepted and rejected references for the finishes this job really includes.
Does one camera arrangement need to handle both finishes? Or will the setup change when the finish changes? That choice belongs in the trial, not in an explanation added after the difficult images appear.
David Baker's point is worth checking against the actual acceptance area. You can make two finishes look similar by excluding exactly the surface quality needs inspected.
Useful to keep that failed comparison with the lesson. People see a clean image and understandably assume the inspection improved. Here it got cleaner by losing something it needed to show.