If someone would like to buy a Nikto or Leia Poncho & send it to me, I could scan & post against my original cards.
In short, its all to do with the halftone dot.
If these re-cards have been reproduced by scanning original cards, they 'should' be slightly blurred compared to an original card. This is because the original card was litho printed & will have a halftone (the image is made of dots if looked at under a magnifying glass). In order to remove this, there would have been a slight blurring added at the scanning stage.
If the repro card when examined has no 'dot' to speak of, it has more than likely been printed on a laser printer. It would then (in theory) be easy-ish to pull the card apart as the teflon in the fuser oil of a laser printer doesn't react that well with glue. However, they could have been printed on adhesive label stock. Even so, a laser printer print would have an ever so slightly waxy finish to it, and either 'no' halftone or, a blurred halftone.
If these are litho-printed/digital press printed (in large quantities), then a half-tone would be present, however there would still be a certain amount of blur/detail loss compared to an original card. This is based on the theory above, that an original card had been scanned.
As stated above, you'd need to see one & compare to an original to be sure.
If someone else wants to spend £7, I'd be happy to investigate..............