You're absolutely right! While there are some differences in terminology and specific features between Google Ads and Meta Ads, the overall ad structure and hierarchy are quite similar. We can easily account for these variations and document them to provide a clear understanding for users of your solution.

Let's break down the ad structure and hierarchy for both platforms:

Google Ads:
1. Campaigns:
   - Represents the top-level organizational unit.
   - Defines the advertising objective, budget, targeting settings, and bidding strategy.
   - Each campaign contains one or more ad groups.

2. Ad Groups:
   - Contains a set of ads and keywords that share a common theme or target audience.
   - Allows for more granular targeting and management within a campaign.
   - Each ad group can have multiple ads and keywords associated with it.

3. Ads:
   - The actual advertisements that are shown to users.
   - Can be in various formats such as text, image, video, or shopping ads.
   - Each ad is associated with a specific ad group.

4. Keywords:
   - The words or phrases that trigger your ads to appear when users search for them.
   - Each keyword is associated with a specific ad group.
   - Keywords help determine when and where your ads are shown.

Meta Ads:
1. Campaigns:
   - Represents the top-level organizational unit.
   - Defines the advertising objective, budget, and schedule.
   - Each campaign contains one or more ad sets.

2. Ad Sets:
   - Contains a set of ads that share common targeting settings and placement.
   - Allows for more granular targeting and management within a campaign.
   - Each ad set can have multiple ads associated with it.

3. Ads:
   - The actual advertisements that are shown to users.
   - Can be in various formats such as image, video, carousel, or collection ads.
   - Each ad is associated with a specific ad set.

As you can see, the ad structure and hierarchy are quite similar between Google Ads and Meta Ads, with only slight variations in terminology (ad groups vs. ad sets) and specific features.

To document these variations, you can create a simple table or comparison chart that highlights the similarities and differences between the two platforms. For example:

| Feature     | Google Ads | Meta Ads    |
|-------------|------------|-------------|
| Top-level   | Campaigns  | Campaigns   |
| Mid-level   | Ad Groups  | Ad Sets     |
| Bottom-level| Ads        | Ads         |
| Targeting   | Keywords   | Audiences   |

By providing clear documentation and mapping the ad structure and hierarchy between Google Ads and Meta Ads, you can help users of your solution easily understand and navigate the similarities and differences.

Additionally, when designing your solution's user interface and API endpoints, you can use consistent naming conventions and structures that align with the common elements of both platforms. This will provide a more unified and intuitive experience for users, regardless of the specific ad platform they are working with.

Remember to keep your documentation updated as the ad platforms evolve and introduce new features or changes to their structure. Regularly review the official documentation from Google Ads and Meta Ads to stay informed about any updates or best practices.