I don't have the pocket size RWS, but if it's the one by Lo Scarabeo, I have their Egyptian Tarot mini. The paper feels thinner and unlaminated as compared to my regular size Lo Scarabeo decks. However, I don't see any problem with that, it still feels like good playing card paper, and it's actually convenient, because I can hardly imagine shuffling a pocket size deck having the thickness (and slickness) of a regular deck.
Anyway, if the pocket RWS you have in mind is the same publisher as the pocket Universal Waite you already have, chances are the cardstock is the same or similar.