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.

• 40387pr0001 Animal Body Part, Dinosaur, Mosasaurus Head, Toothed with Pin, Dark Gray, Red, and Dark Blue Print Print of this part
• 40375 Animal / Creature Body Part, Dinosaur Neck / Tail Ring Pair of this part