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.

• 18153pr0001 Creature Body Part, Dragon Head Upper Jaw with Spikes with Tan Teeth and Orange Eyes Print this part is a pair of it
• 18769 Creature Body Part, Dragon Torso with Spikes and Gold Ventral Scales Print Pair of this part