Not sure how much it matters now, but...
I've obtained a sealed set and can confirm that the check list is (mostly) correct. There are no 2 Pop Warner cards, so I've submitted an IR to remove one (and the name on front is "Pop" Warner). There's also no numbering on the cards, so I've submitted an IR to have them all changed to NNO. There is a Mike Ferris card in this set.
As for having two very similar sets, I know for several years the Springfield Cardinals have printed one set as a attendance giveaway and then printed another set with a different design that same year that is exclusively sold in the team store. I imagine the same thing is happening here, although I don't have the other 2007 set to confirm.
EDIT: Just realized there is a Louie/Fetch card in the set but not added to the checklist. Submitted another IR to rectify it.