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Assuming that user_A and user_B set up and exchange public ssh keys with each other, is it possible for user_A to su into user_B on the same machine?

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The ability to use su is usually controlled by pam, and has nothing to do with public key authentication as used with ssh.

Provided the public key of user_A is in user_B's authorized_keys file, all user_A needs to do is:

$ ssh user_B@localhost

It might the wording is not totally clear in your question, but private keys are not shared.

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