Importing requestors from AD where it was previously disabled

Importing requestors from AD where it was previously disabled

I am looking at re-enabling the AD import feature in SDP. We disabled it a while ago (years ago) because of some issues we've had with it. Since then, we've been adding requestors manually. I would like to re-enable this feature. I would like to know what exactly would happen with our existing requestors. How does SDP compare existing requestors with users in AD? Is it strictly by username? And how is the site mapped? Is it by a specified AD field? Thanks!
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