There's literally no difference if all the cards are printed on the same stock. The paint could add a little extra weight to some cards, but I don't think this would be much of a noticeable difference.
I think people feel that certain TXI cards handle differently to others because possibly one day they had dirt and oil on their hands before handling a deck, and then another day had very clean hands when handling a different deck.
Just wash your hands before opening and handling a deck and there will be no issues - as long as all your decks are stored in the same conditions