Separate setup need to be done for GAM mediation, Get started with mediation article might help you with further proceedings.
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Mobile Ads SDK Team |
Hi,
Yes, the replacement of current AdMob ad unit identifiers with the corresponding identifiers from your Ad Manager account is a necessary step. Since you have already implemented the mobile ads SDK, most of the ad request code should remain similar.
If you were using mediation with AdMob, you will need to reconfigure it within the ad manager.
Please reach out to us, if you need any further assistance.

For Connecting Ad units to ad networks - while adding an ad unit mapping Choose the mapped inventory :
Kindly refer Add an ad unit mapping article for further assistance regarding adding an ad unit mapping.