You compare filters with flow meters ,microscopes & electromagnetic filters & / or centrifuges .
Which is why I now get wet pants laughing when some You-Fool video appears where the fool cuts a few filters apart and does a comparison with noting more that their blind eyes.
The best you might hope to see would be an obvious manufacturing defect.
A filter made in a first world country should not have any because each & every filter is tested on the line at every stage and as they come off the line
Failures are punctured & drop into the scrap metal bin , but as they are bad feed, most would go to land fill .