Migrating or Synchronizing SSAS Changes
You might not consider it as "easy", but I've done it a few times via the following method, which had the virtue of being easier than the alternatives of checking every setting in BIDS.

In BIDS you can create a New project and import it from your existing DB1 (and then DB2.)  Now you have Solution folders/files for each DB.  You can use WinDiff to compare the folders and XML files within them and sync them by hand, if you're bold enough and/or the differences are small enough. You have to use some intelligence and intuition which object IDs you may need to copy/change and which to leave alone. 

If you can't get that to work, the WinDiff-generated XML differences should at least remind you and/or point you to what has been changed in BIDS and you can make changes to the DB2 project files by hand via the normal BIDS UI.