I updated to AE 2021 and the color of some illustrator files changed slightly! They seem a bit lighter. See attachment. You can see around the eyes are some shapes to have it close the eyes etc. The character is an illustrator file, which has changed color.
What's the exact version of After Effects. Did you use the Create Shapes from Vector Layer feature while building this artwork? I am asking this because the 18.1 update has a bug fix that was causing a slight color shift when Create Shapes from VectorLayer was used in the 18.0 and 18.0.1 version.