Happily, these are the same thing! The 'firebase-ads' dependency just brings in the existing 'play-services-ads' library and the 'firebase-analytics' library. The Firebase SDK is part of Google Play services, so no need to worry about migrating, just update to the latest version.
Exactly as Kastriot says, the main integration is between Firebase Analytics and AdMob, but the AdMob SDK is still the same service you're already familiar with.
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