To compare and synchronize the differences of two database defaults, you can go through the following steps. The screenshots can be good guider for you.
Step 1: Open SQL Server Comparison Expert, click "Connection" button, then the connection dialog pop up.
Step 2: Click "Option" to open the Project Option, you can select the Object Types (Defaults) to be compared. Click "OK" to continue.
Step 3: Click "OK" in the connection dialog, select the "Compare" button to compare the differences between the two database defaults.
Step 4: You will find the differences in the compared strcture results. Click "
Synchronize", you'll see the script which can make the two database defaults have no differences.
Step 5: Click on "Sync", then you will be prompted to backup the target database. If you want to backup your database manually, please choose "No" in the confirm dialog.
Step 6: Click "
Yes" and you will see the action status changed from "

"
to "

", this told you that the synchronization has been completed successfully.