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Drupal: How to differentiate between new user registration and user password update in hook_user validate operation?

I am using hook_user validate operation to validate user registration info against my business logic.

I want separate logics to run on registration and change password.

But I am unable to differentiate between the two - both pass through validation and same code is run for both.

How can I differentiate between the two inside the validate op in hook_user?

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