A good question, and one we have enjoyed conversing about here in SoCal - placement of decals.
My view is the while we tend to obsess over these details, exact locations are not really known. This as evidenced by different locations in different original cars.
I would keep in mind that there was no "locator" tool for decals, these were put on as the car came down the line, and could be in somewhat different locations depending on who was doing the application. While partially hand built, the folks on the line were trying to get the iron out the door and were not going to be spending time trying to ensure that such and such label was exactly 10cm from there, or 20 cm from that.
Again, my rumination on a Wed morning.