I’m pretty sure you don’t know what you’re talking about. Perceptual matching is not image matching.

Perceptual matching is used to sort categories of images. A quick DuckDuckGo will turn up many results. No stretch of the imagination will turn this into a bit for a bit comparison. This is a machine learning algorithm used to categorize images. https://www.ibm.com/blogs/research/2019/10/learning-implicit...

Matthew Green is tweeting about this: https://twitter.com/matthew_d_green/status/14230711866160005... and mentions that it is "preceptial hashing”

9 to 5 Mac article, in which they restate that it is not a classical bit-by-bit hash:

https://9to5mac.com/2021/08/05/scanning-for-child-abuse-imag...