The reason for this is as follows

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Advertising management systems do not share research results.
The data you receive depends on the windows and attribution models the advertiser chooses, and they can vary.
Google has a harder time collecting information on cartoon attributions. Facebook has an easier task because people use their logins on all kinds of gadgets.

Facebook has presented the world with a new Real cell phone number list tool that allows you to evaluate the effectiveness of advertising placement taking into account clicks and impressions - its name is Attribution. All analytical data in it is accumulated from the moment the attribution project is created. The social network sets the parameters of the project and accumulates data, and then places it in the "Efficiency" report. We suggest figuring out what an attribution project is.

Types of Attribution Models Available
The main difference between the models is in determining the weight of the touch involved in the conversion. The operating principle of the models is based on the rules used to build the algorithm, or statistics.