The Adobe-built Google Gtag extension injects the Google Global Site Tag (gtag) library on the page. Similarly, the Acronym version will inject the library on the page once a relevant rule action has been triggered.
To migrate the extension configuration, simply take the account IDs (separated by commas) from the Adobe extension and add each account ID to the Acronym extension.
If you have set the custom data layer option in the Adobe extension, you can copy this value to the advanced settings field: Data Layer Name.
The Adobe-built extension does not have any rule actions to migrate.