Global Template for different reports

Hello all,

I have built a pbix file with different report pages. The data of this report are on a SQL server. So far so simple. But now the case is that we have many different customers and for each of these customers there is a separate database on the SQL server. The structure and naming of the data, tables and columns etc. is always the same. This means, for example, that the fact table is always named the same and also the column names are always the same, only the data values are of course always different.

Now I would like to offer the same Power BI report for each of these customers. So always with the same visuals and report pages (everything exactly like the created pbix file). Is there any way to create this pbix file as a global template, so that when I make a change, error, etc., I only need to change the template file and then this change will affect all other reports?
FYI, I publish the reports all through Power BI Desktop and then have distributed them to customers through app.powerbi.com.

Thanks for your help and best regards!