Repeats are fine, especially with nice pics like those.
Pat really is doing an amazing job with this. Especially extending it to matching up a flaw from the front, which really nails down those two being side by side.
The other thing about multiple scans is that eventually it might be possible to narrow down one group as being done after another group depending on how much of the scratch shows. Less might indicate wear to the plate, or a light resurfacing after wear. (A deep scratch on a stone might survive a light resurfacing, and there's a couple scans I have that I think show the scratches surviving into the 350 series. )
Steve B