Android api level 19 means the android os version (kitkat) . It contains the standard android packages(from Android Open Source Projects). But the google api 19 is the android api 19+ google api’s like google settings and other packages provided by google.
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Android API Levels VersionSDK / API levelYearAndroid 11Level 302020targetSdk must be 30+ for new apps and app updates.Android 10Level 292019Android 9Level 282018API Levels | Android versions, SDK/API levels, version codes … apilevels.com
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The system version is 4.4. For more information, see the Android 4.4 API Overview.
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