The "standard" that BGS and PSA use is both outdated and very oversimplified. Both companies label error cards as the common card, call the exact same card different versions and really struggle in general with this card and its many many versions. PSA labels cards with hardly any tinting at all "Ad obscured" and cards with much more tinting "Ad on Scoreboard". I'll try to post some images of examples of how convoluted the grading companies are with these cards. I have some photos and info about the cards on this facebook page link too.
https://www.facebook.com/pages/1989-Flee...676&type=1
https://www.facebook.com/pages/1989-Flee...676&type=1