This question is similar to:  Why does my SSH private key still work after changing some bytes in the file?
But in this case (on Windows) after editing the authorized_keys file and changing some characters in a public key the login still works ?
Is the same reason of  ?
Some characters in the public key are irrelevant ?
In this case the correct key is:
IF i change it to (replace C1 with C9):
The login works, if i change AAAA then it does not work any more.