I've done something like that but with natural hones only.
Here (lower part of the page)
The 5 blades were identical and the number of strokes as well.
Such a test to see what each hone can do is not too reliable
because you have a scratched surface that you want to get smoother.
Its like bending a horse shoe straight.
The better method would be using a hone on a pristine surface like a piece of a CD.
Anyway, cheap eBay blades can be very different.