Variants of a mold are catalogued separately, so each one has its own sets and minifigs. Check these too if something you expect is missing here.

• 3001pr0043 Brick 2 x 4 with Smile and Frown Print on Opposite Sides this part is a mold of it
• 3001a Brick 2 x 4 without Cross Supports this part is a print of it