Question Using Multiple catalogs

I have two separate projects that both builds different addressable bundles, and they have to sync (See the example)
I'm looking for a good way to tackle this problem.
Before you ask, it is impossible in our use case to have all the assets in the same project.

Example :
Project A has the following bundles :
Scene 1
Scene 2
Scene 4

Project B (Just used for building assets):
Scene 3

In this case, each of the project have their own catalogs and bundles, and what I'm trying to achieve is the following :
Project A know about all the scenes (1-4)

 

Looking at both JSON files generated, I could definitely merge them, but I'm wondering how this is going to play out with the .hash file