No, perceptual hashes don't work that way. It's a comparison of similarity to a target, not just making an MD5 hash of an image.

Here's Apple's documentation on it : https://www.apple.com/child-safety/pdf/CSAM_Detection_Techni...

Thats not how it works. The fingerprints/hashes do not need be exactly the same. Just close enough. The fingerprint/hash is designed to not change much if the pictures are similar.

Simplified: If you draw a circle and i draw a circle, their fingerprints will be closer then if I would have drawn a rectangle.