Unfortunately this isn't possible. The only way to identify objects that are different on the server is by retrieving the definition for each object from the corresponding server and performing a comparison, which is written into the code of the application.
We could potentially extend the Comparison Report functionality such that it performs the comparison at the project level rather than the server level. The only problem I forsee with this is the amount of time it would take for the report to generate, which would depend on how many servers and databases needed to be checked.
Theoretically, if you could set up linked servers from your source control server to the other servers, it may be possible to create a query that pulls data from the sys.sql_modules table on each database into a temporary table in the source control database. You would then potentially be able to join this table to the DatabaseObject table and figure out which objects are different and/or don't exist in source control.
That's just an idea though and would involve a bit more thought I imagine.
I'll see if we can come up with something that works from within the application.
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