Perhaps some context.
Fundamentally, the ISO 4548-12 test introduces a standardized test media at a standard rate, and measures contaminant capacity of a filter (in grams of material), and its particulate removal characteristics (percentage captured of every particle size from 3µm to around 50µm), while monitoring differential pressure across the element. The test cycle is currently proposed to end at 10 psi drop across the element (69 kPad).
In the context of used vs new screen filters, the overall effect of prior contamination is predictable. The measured contaminant capacity will go down, as prior deposits will shorten the time to reach 10 psid. Put another way, there is some degree of element blockage before the test starts. That's the wildcard; we can't know the exact degree of blockage following operator cleaning. There are clearly differences between individual cleaning methods, as well as operating conditions....oil type/temperature and blow-by carbon being examples.
I have Vic's elements in hand. They don't look anything like Dan57's photos above, and Mickey says his also look different. Yet all are experienced operators.
Let's stick with new elements as the baseline. It removes the above variables, and there's no big downside, as the blockage rate will be pretty obvious from the test results. Future operators can safely assume they have less available capacity due to prior deposits.