Usually, yes. It’s very normal for children to display specific signs of brain injury that adults do not. Keep in mind that a child may also have typical brain injury symptoms, too—like nausea, dizziness, and sensitivity to different stimuli (light, touch, etc.).
Some examples of signs of brain injuries unique to children include:
Different eating and sleeping patterns
Difficulty hearing
Minimized attention span
Difficulty shifting attention
Change in bladder or bowel function