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.

• 98057 Animal Body Part, Dinosaur, Tyrannosaurus Rex Lower Jaw [Plain] this part is a print of it
• 98161pr0003 Animal Body Part, Dinosaur, Tyrannosaurus Rex Head with Pin, White Teeth, Dark Orange Top and Dark Brown Stripes Print this part is a pair of it
• 98161pr0004 Animal Body Part, Dinosaur, Tyrannosaurus Rex Head with Pin, Dark Tan Top and Reddish Brown Stripes Print this part is a pair of it
• 98161pr0005 Animal Body Part, Dinosaur, Tyrannosaurus Rex Head with Pin, White Teeth, Black and Dark Orange Top and Black and Bright Light Orange Spots Print this part is a pair of it
• 98161pr0006 Animal Body Part, Dinosaur, Tyrannosaurus Rex Head with Pin, Light Bluish Grey Teeth, Dark Bluish Gray Top and Dark Brown Stripes Print this part is a pair of it
• 98161pr0009 Animal Body Part, Dinosaur, Tyrannosaurus Rex Head with Pin, Tan Teeth, Dark Tan Top and Dark Brown Stripes Print Pair of this part